{"title":"Audio Research","description":null,"products":[{"product_id":"audio-research-i-70-integrated-amplifier","title":"Audio Research I\/70 Integrated Amplifier","description":"\u003ch1\u003eAudio Research I\/70 Integrated Amplifier\u003c\/h1\u003e\n\u003ch3\u003e70 watts per channel of KT120 tube power with auto-bias, flexible preamplifier outputs, and optional phono and digital modules\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cp\u003eThe Audio Research I\/70 brings the company's tube preamplifier and power-amplifier expertise together in a single integrated amplifier. Four KT120 output tubes deliver 70 watts per channel, while an output transformer derived from the Reference 75 amplifier connects the I\/70 directly to Audio Research's established separates heritage.\u003c\/p\u003e\n\u003cp\u003eThe I\/70 is designed and built by hand at Audio Research's Minnesota facility, where each amplifier is twice tested and individually auditioned in the company's reference system. Its industrial design takes cues from the REF330M, with anodized top and bottom plinths, a fully enclosed transformer array, machined aluminum, meshwork, and distinctive Audio Research badging.\u003c\/p\u003e\n\u003ch4\u003eTube Power Without Manual Biasing\u003c\/h4\u003e\n\u003cp\u003eAuto-bias eliminates the routine adjustment traditionally associated with many tube power amplifiers. The I\/70 continuously maintains the operating bias of its four KT120 output tubes, making tube ownership considerably more straightforward while maintaining proper operating conditions.\u003c\/p\u003e\n\u003cp\u003eThe amplifier provides dedicated 4-ohm and 8-ohm output taps for matching a range of loudspeakers. Audio Research rates the I\/70 at 70 watts per channel continuously from 20 Hz–20 kHz.\u003c\/p\u003e\n\u003ch4\u003eIndependent Preamplifier and Power-Amplifier Sections\u003c\/h4\u003e\n\u003cp\u003eThe I\/70 incorporates independent tube preamplifier and tube power-amplifier sections. Stereo preamplifier outputs provide additional system flexibility, including the ability to feed powered subwoofers equipped with line-level inputs.\u003c\/p\u003e\n\u003cp\u003eAn active tube preamplifier section and 75-step volume control provide a broad range of level adjustment, particularly useful when moving among sources and recordings with substantially different output levels.\u003c\/p\u003e\n\u003ch4\u003eOptional Phono and Digital Capability\u003c\/h4\u003e\n\u003cp\u003eThe standard analog input complement consists of three sets of single-ended inputs and one balanced XLR input. Optional phono and digital boards expand the I\/70's source capabilities.\u003c\/p\u003e\n\u003cp\u003eThe optional phonostage accommodates both moving-magnet and moving-coil cartridges, with gain settings selectable from the I\/70 remote. Moving-coil loading is adjustable from 50–1,000 ohms.\u003c\/p\u003e\n\u003cp\u003eThe optional digital board uses an AKM Velvet Sound DAC and provides USB, optical, coaxial, and Bluetooth connectivity. Incoming digital signals are upsampled by the DAC section.\u003c\/p\u003e\n\u003ch4\u003eHeadphone Listening From the Main Output Tubes\u003c\/h4\u003e\n\u003cp\u003eRather than relying on a separate convenience headphone circuit, the I\/70's headphone output is driven by its KT120 output tubes. This gives headphone listeners access to the amplifier's primary tube output stage for personal listening.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e70 Wpc continuous tube output from 20 Hz–20 kHz\u003c\/li\u003e\n\u003cli\u003eFour KT120 output tubes with automatic biasing\u003c\/li\u003e\n\u003cli\u003eOutput transformers derived from the Audio Research Reference 75 amplifier\u003c\/li\u003e\n\u003cli\u003eIndependent tube preamplifier and tube power-amplifier sections\u003c\/li\u003e\n\u003cli\u003e75-step volume control\u003c\/li\u003e\n\u003cli\u003eThree single-ended analog inputs and one balanced XLR analog input as standard\u003c\/li\u003e\n\u003cli\u003eStereo preamplifier outputs for external amplification or powered subwoofers with line-level inputs\u003c\/li\u003e\n\u003cli\u003e4-ohm and 8-ohm speaker output taps\u003c\/li\u003e\n\u003cli\u003eHeadphone output driven by the KT120 output tubes\u003c\/li\u003e\n\u003cli\u003eOptional MM\/MC phonostage with remotely selectable gain and adjustable MC loading from 50–1,000 ohms\u003c\/li\u003e\n\u003cli\u003eOptional AKM-based digital board with USB, optical, coaxial, and Bluetooth inputs\u003c\/li\u003e\n\u003cli\u003eEight total inputs with both optional phono and digital boards installed\u003c\/li\u003e\n\u003cli\u003eAvailable with black or silver anodized plinths\u003c\/li\u003e\n\u003cli\u003eHand-built, twice tested, and individually auditioned at Audio Research's Minnesota facility\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003ePower Output:\u003c\/b\u003e 70 Wpc continuous from 20 Hz–20 kHz; 1 kHz total harmonic distortion typically 1% per channel, below 0.1% at 1 W\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePower Bandwidth (-3 dB Points):\u003c\/b\u003e 10 Hz–22 kHz\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eFrequency Response (-3 dB Points At 1 W):\u003c\/b\u003e 7 Hz–30 kHz\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eInput Sensitivity:\u003c\/b\u003e 1.25 V RMS for rated output\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eInput Impedance:\u003c\/b\u003e 100 kohms balanced; 48 kohms single-ended\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eOutput Polarity:\u003c\/b\u003e Non-inverting; balanced input pin 2+ (IEC-268)\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eStandard Analog Inputs:\u003c\/b\u003e Three single-ended, one balanced\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eMaximum Inputs With Optional Phono And Digital Boards:\u003c\/b\u003e 8\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eOutput Taps:\u003c\/b\u003e 8 ohms, 4 ohms\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePower Requirements (US):\u003c\/b\u003e 105–130 V AC, 60 Hz; 420 W at rated output, 220 W at idle\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eTubes Required:\u003c\/b\u003e Two matched pairs KT120; three 6922 (one input, two driver)\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDimensions (H × W × D):\u003c\/b\u003e 8.25\" x 16.5\" x 13.5\" (210 x 420 x 340 mm)\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eWeight:\u003c\/b\u003e 55 lb. (25 kg)\u003c\/p\u003e","brand":"Audio Research","offers":[{"title":"Black \/ No Addons","offer_id":53876967145656,"sku":"ARCI70-BLK","price":9950.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ With DAC Card","offer_id":53876967178424,"sku":"ARC-I70-BLK-DAC","price":10950.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ With Phono Card","offer_id":53876967243960,"sku":"ARC-I70-BLK-PHN","price":10950.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ With DAC \u0026 Phono Card","offer_id":53876967211192,"sku":"ARC-I70-BLK-DAP","price":11450.0,"currency_code":"USD","in_stock":true},{"title":"Natural (Silver) \/ No Addons","offer_id":53876967276728,"sku":"ARC-I70-NAT","price":9950.0,"currency_code":"USD","in_stock":true},{"title":"Natural (Silver) \/ With DAC Card","offer_id":53876967309496,"sku":"ARC-I70-NAT-DAC","price":10950.0,"currency_code":"USD","in_stock":true},{"title":"Natural (Silver) \/ With Phono Card","offer_id":53876967375032,"sku":"ARC-I70-NAT-PHN","price":10950.0,"currency_code":"USD","in_stock":true},{"title":"Natural (Silver) \/ With DAC \u0026 Phono Card","offer_id":53876967342264,"sku":"ARC-I70-NAT-DAP","price":11450.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/files\/I-70-1-1500px-1.jpg?v=1786381852"},{"product_id":"audio-research-ls-2-preamplifier","title":"Audio Research LS-2 Preamplifier","description":"\u003ch1\u003eAudio Research LS-2 Preamplifier\u003c\/h1\u003e\n\u003ch3\u003ePure-Tube, Zero-Feedback Class-A Design With 6H30 Tubes and a Full Touchscreen Interface\u003c\/h3\u003e\n\u003cp\u003eInspired by the original LS2 line stage introduced in 1992, the Audio Research LS-2 brings the company’s tube preamplifier tradition into a thoroughly modern platform. Its signal path is pure tube, with no solid-state devices, using two 6H30 dual-triode tubes in a single gain stage operating in pure class-A with zero feedback.\u003c\/p\u003e\n\u003cp\u003eThe LS-2 employs a cathode-follower design and constant-current cathode bias, combining a deliberately simple signal path with the current capability of the 6H30. Audio Research describes the result as having clarity, finesse, harmonic richness, dynamic swing, and a natural resolution of detail.\u003c\/p\u003e\n\u003ch4\u003eA Modern Audio Research Interface\u003c\/h4\u003e\n\u003cp\u003eThe LS-2 pairs its traditional tube circuitry with an all-new touchscreen interface. The display provides balance control, input naming, adjustable intensity, color selection, and additional operating functions, with typography derived from the Reference-series GhostMeters. A new machined-metal remote provides control from the listening position.\u003c\/p\u003e\n\u003ch4\u003eFlexible Analog With Optional Digital and Phono\u003c\/h4\u003e\n\u003cp\u003eBalanced XLR and single-ended RCA connections accommodate a range of source components. For systems requiring additional functionality, the LS-2 can be expanded with a user-installable DAC card providing USB, coaxial, and optical inputs. A separate user-installable MM\/MC phonostage card provides 42 dB of gain for moving-magnet cartridges and 62 dB for moving-coil cartridges. Both cards are optional.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePure-tube signal path with two 6H30 tubes\u003c\/li\u003e\n\u003cli\u003eSingle gain stage operating in pure class-A\u003c\/li\u003e\n\u003cli\u003eZero-feedback circuit design\u003c\/li\u003e\n\u003cli\u003eCathode-follower topology with constant-current cathode bias\u003c\/li\u003e\n\u003cli\u003eBalanced XLR and single-ended RCA inputs\u003c\/li\u003e\n\u003cli\u003eFull touchscreen interface with balance control and input naming\u003c\/li\u003e\n\u003cli\u003eAdjustable display intensity and color\u003c\/li\u003e\n\u003cli\u003eMachined-metal remote control\u003c\/li\u003e\n\u003cli\u003eOptional user-installable DAC card with USB, coaxial, and optical inputs\u003c\/li\u003e\n\u003cli\u003eOptional user-installable MM\/MC phonostage card with 42 dB\/62 dB gain\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003eFrequency Response (At Rated Output, Balanced, 100 kOhms Load):\u003c\/b\u003e -0.3 dB at 10 Hz, -0.3 dB at 40 kHz\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eTHD + Noise (2 V RMS Balanced Output, 10 Hz–80 kHz, Unweighted):\u003c\/b\u003e \u0026lt;0.03%\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eNoise (Maximum Volume, 99):\u003c\/b\u003e -77 dBV\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eCrosstalk:\u003c\/b\u003e -76 dB\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eGain:\u003c\/b\u003e 12 dB balanced output, 12 dB single-ended output\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eInput Impedance:\u003c\/b\u003e 25 kOhms balanced and single-ended\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eOutput Impedance:\u003c\/b\u003e 10 ohms balanced, 225 ohms single-ended\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eOutput Polarity:\u003c\/b\u003e Inverting, balanced and single-ended\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePower Requirements:\u003c\/b\u003e 120 VAC, 60 Hz, 35 W maximum\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eStandby Power:\u003c\/b\u003e 120 VAC, 60 Hz, 4.4 W\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eTubes Required:\u003c\/b\u003e 2 x 6H30\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDimensions (H × W × D):\u003c\/b\u003e 7\" x 19\" x 17.5\" (177.8 x 482.6 x 444.5 mm)\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eWeight:\u003c\/b\u003e 33 lb. (15 kg)\u003c\/p\u003e\n","brand":"Audio Research","offers":[{"title":"Black \/ No Addons","offer_id":53876967407800,"sku":"ARC-LS2-BLK","price":8450.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ Optional DAC Card","offer_id":53876967440568,"sku":"ARC-LS2-BLK-DAC","price":9450.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ DAC \u0026 Phono Card (Preinstalled)","offer_id":53876967473336,"sku":"ARC-LS2-BLK-DAP","price":9950.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ Optional Phono Card","offer_id":53876967506104,"sku":"ARC-LS2-BLK-PHN","price":9450.0,"currency_code":"USD","in_stock":true},{"title":"Natural (Silver) \/ No Addons","offer_id":53876967538872,"sku":"ARC-LS2-NAT","price":8450.0,"currency_code":"USD","in_stock":true},{"title":"Natural (Silver) \/ Optional DAC Card","offer_id":53876967571640,"sku":"ARC-LS2-NAT-DAC","price":9450.0,"currency_code":"USD","in_stock":true},{"title":"Natural (Silver) \/ DAC \u0026 Phono Card (Preinstalled)","offer_id":53876967604408,"sku":"ARC-LS2-NAT-DAP","price":9950.0,"currency_code":"USD","in_stock":true},{"title":"Natural (Silver) \/ Optional Phono Card","offer_id":53876967637176,"sku":"ARC-LS2-NAT-PHN","price":9450.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/files\/LS3-black-front_jpg.webp?v=1787933390"},{"product_id":"audio-research-ls-3-preamplifier","title":"Audio Research LS-3 Preamplifier","description":"\u003ch1\u003eAudio Research LS-3 Preamplifier\u003c\/h1\u003e\n\u003ch3\u003eFully Dual-Mono Solid-State Design With Balanced JFET Inputs, Class-A Outputs, and Touch-Screen Control\u003c\/h3\u003e\n\u003cp\u003eInspired by the original LS3 line stage introduced in 1992, the Audio Research LS-3 is a modern solid-state preamplifier built around a fully balanced differential JFET input stage, bipolar transistor voltage amplification, and class-A output stages. It brings Audio Research's current solid-state engineering to a dedicated line-stage design while retaining the company's recognizable visual identity.\u003c\/p\u003e\n\u003cp\u003eThe LS-3 uses a fully dual-mono signal path with separate power transformers for the two channels. Linear power supplies and a zero-gain cascaded voltage reference support the low-noise circuitry, while balanced and single-ended connections make the LS-3 straightforward to integrate into a wide range of systems.\u003c\/p\u003e\n\u003ch4\u003eModern Control and Display\u003c\/h4\u003e\n\u003cp\u003eAn all-new touch-screen display provides access to functions including input naming, display-intensity adjustment, and selectable display colors. Its typography draws on the appearance of Audio Research's Reference GhostMeters, giving the LS-3 a contemporary interface that remains visually connected to the company's current components.\u003c\/p\u003e\n\u003ch4\u003eAll-Aluminum Chassis\u003c\/h4\u003e\n\u003cp\u003eThe LS-3 shares its all-aluminum chassis with the tube-based LS-2. Audio Research designed the enclosure for the stability and rigidity needed to isolate the internal circuitry, combining the company's traditional proportions with a cleaner, more modern appearance.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFully balanced differential JFET input stage\u003c\/li\u003e\n\u003cli\u003eBipolar transistor-based voltage amplifier\u003c\/li\u003e\n\u003cli\u003eClass-A output stages\u003c\/li\u003e\n\u003cli\u003eFully dual-mono signal path\u003c\/li\u003e\n\u003cli\u003eSeparate power transformers for each channel\u003c\/li\u003e\n\u003cli\u003eLinear power supplies\u003c\/li\u003e\n\u003cli\u003eZero-gain cascaded voltage reference\u003c\/li\u003e\n\u003cli\u003eBalanced XLR and single-ended RCA connectivity\u003c\/li\u003e\n\u003cli\u003eTouch-screen display with input naming, intensity adjustment, and selectable colors\u003c\/li\u003e\n\u003cli\u003eAll-aluminum chassis\u003c\/li\u003e\n\u003cli\u003eUser-installable optional DAC card with USB, coaxial, and optical inputs\u003c\/li\u003e\n\u003cli\u003eUser-installable optional MM\/MC phono card\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003eFrequency Response:\u003c\/b\u003e ±0 dB, 10 Hz–40 kHz at rated output (balanced, 100k-ohm load)\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eTHD + Noise:\u003c\/b\u003e Less than 0.007% at 2 V RMS balanced output\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eNoise:\u003c\/b\u003e -75 dBV at maximum volume (99)\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eCrosstalk:\u003c\/b\u003e -82 dB\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eGain:\u003c\/b\u003e 20 dB balanced output; 20 dB single-ended output\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eInput Impedance:\u003c\/b\u003e 25k ohms balanced and single-ended\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eOutput Impedance:\u003c\/b\u003e 10 ohms balanced; 25 ohms single-ended\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eOutput Polarity:\u003c\/b\u003e Balanced: non-inverting; single-ended: inverting\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePower Requirements:\u003c\/b\u003e 120 VAC, 60 Hz, 35 W maximum\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eStandby Power:\u003c\/b\u003e 4.2 W\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDimensions (H × W × D):\u003c\/b\u003e 7\" x 19\" x 17.5\" (17.78 x 48.26 x 44.45 cm)\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eShipping Weight:\u003c\/b\u003e 48 lb. (21.8 kg)\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eWeight:\u003c\/b\u003e 33 lb. (15 kg)\u003c\/p\u003e\n","brand":"Audio Research","offers":[{"title":"Black \/ No Addons","offer_id":53876967768248,"sku":"ARC-LS3-BLK","price":7450.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ Optional DAC Card","offer_id":53876967801016,"sku":"ARC-LS3-BLK-DAC","price":8450.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ DAC \u0026 Phono Card (Preinstalled)","offer_id":53876967833784,"sku":"ARC-LS3-BLK-DAP","price":8950.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ Optional Phono Card","offer_id":53876967866552,"sku":"ARC-LS3-BLK-PHN","price":8450.0,"currency_code":"USD","in_stock":true},{"title":"Natural (Silver) \/ No Addons","offer_id":53876967899320,"sku":"ARC-LS3-NAT","price":7450.0,"currency_code":"USD","in_stock":true},{"title":"Natural (Silver) \/ Optional DAC Card","offer_id":53876967932088,"sku":"ARC-LS3-NAT-DAC","price":8450.0,"currency_code":"USD","in_stock":true},{"title":"Natural (Silver) \/ DAC \u0026 Phono Card (Preinstalled)","offer_id":53876967964856,"sku":"ARC-LS3-NAT-DAP","price":8950.0,"currency_code":"USD","in_stock":true},{"title":"Natural (Silver) \/ Optional Phono Card","offer_id":53876967997624,"sku":"ARC-LS3-NAT-PHN","price":8450.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/files\/LS3-black-front.jpg?v=1786386043"},{"product_id":"audio-research-ph9-phonostage","title":"Audio Research PH9 Phonostage","description":"\u003ch1\u003eAudio Research PH9 Phono Stage\u003c\/h1\u003e\n\u003ch3\u003eAll-Tube Phono Preamplification With Five Selectable Cartridge Loads and Remote-Controlled Setup\u003c\/h3\u003e\n\u003cp\u003eThe Audio Research PH9 brings the company’s long-running vacuum-tube approach to vinyl playback into a flexible, single-chassis phonostage designed to work with a broad range of cartridge and turntable combinations. Three 6H30 vacuum tubes form the core of its audio circuit, with additional tube regulation in the power supply.\u003c\/p\u003e\n\u003cp\u003eWith 58 dB of gain and five selectable impedance settings, the PH9 provides useful flexibility when matching a cartridge to the phonostage. Loading can be changed among 47k, 1,000, 500, 200, and 100 ohms, allowing you to experiment with cartridge loading without opening the chassis or changing components.\u003c\/p\u003e\n\u003ch4\u003eCartridge Setup From the Listening Chair\u003c\/h4\u003e\n\u003cp\u003eThe PH9’s loading settings can be changed on the fly using the included metal remote control. Its menu system also provides access to cartridge impedance, tube hours, auto shutdown, and other operating functions. A tube-hour meter makes it easy to keep track of operating time, while the display can be turned off when desired.\u003c\/p\u003e\n\u003ch4\u003e6H30 Vacuum-Tube Signal Path\u003c\/h4\u003e\n\u003cp\u003eThree high-current 6H30P dual triodes handle the audio signal, while a 6550WE and an additional 6H30P are used in the power supply. Electronically regulated low- and high-voltage supplies are complemented by an automatic two-minute warm-up and brown-out mute circuit.\u003c\/p\u003e\n\u003cp\u003eThe PH9 uses single-ended connectivity and provides a fixed 58 dB of gain. Its combination of adjustable loading, remote operation, and straightforward tube architecture makes it a particularly versatile Audio Research option for a vinyl-focused system.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThree 6H30P dual triodes in the audio circuit\u003c\/li\u003e\n\u003cli\u003e58 dB fixed gain at 1 kHz\u003c\/li\u003e\n\u003cli\u003eFive selectable cartridge loads: 47k, 1,000, 500, 200, and 100 ohms\u003c\/li\u003e\n\u003cli\u003eCartridge loading adjustable on the fly\u003c\/li\u003e\n\u003cli\u003eRemote-controlled operation and menu functions\u003c\/li\u003e\n\u003cli\u003eTube-hour meter\u003c\/li\u003e\n\u003cli\u003eAuto-shutdown function\u003c\/li\u003e\n\u003cli\u003eSwitchable display\u003c\/li\u003e\n\u003cli\u003eElectronically regulated low- and high-voltage power supplies\u003c\/li\u003e\n\u003cli\u003e6550WE and 6H30P vacuum tubes used in the power supply\u003c\/li\u003e\n\u003cli\u003eAutomatic two-minute warm-up and brown-out mute\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eIncluded Accessories\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMetal remote control\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003eFrequency Response:\u003c\/b\u003e ±0.2 dB of RIAA, 5 Hz–20 kHz; 1 dB points below 0.3 Hz and above 80 kHz\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDistortion (3 V RMS, 1 kHz Output):\u003c\/b\u003e Less than 0.015%\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eGain (1 kHz):\u003c\/b\u003e 58 dB\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eInput Impedance:\u003c\/b\u003e Selectable loads: 47k, 1,000, 500, 200, and 100 ohms\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eOutput Impedance:\u003c\/b\u003e 200 ohms; recommended load 50k–100k ohms and 100 pF; 10k ohms minimum and 2,000 pF maximum\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eOutput Polarity:\u003c\/b\u003e Non-inverting\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eMaximum Input (1 kHz):\u003c\/b\u003e 80 mV RMS\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eRated Output:\u003c\/b\u003e 0.5 V RMS, 10 Hz–60 kHz, into 100k-ohm load; maximum balanced output capability is 0.46 V RMS at less than 0.5% THD at 1 kHz\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eControls:\u003c\/b\u003e 6 push buttons: Power, Menu, Option, Enter, Input, Mute\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePower Supplies:\u003c\/b\u003e Electronically regulated low- and high-voltage supplies; automatic two-minute warm-up\/brown-out mute; line regulation better than 0.01%\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eNoise:\u003c\/b\u003e 77 dB, shorted inputs\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eTube Complement:\u003c\/b\u003e 3 x 6H30P dual triodes; 1 x 6550WE and 1 x 6H30P in power supply\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePower Requirements (US):\u003c\/b\u003e 100–125 VAC, 60 Hz; 120 W maximum; 2 W standby\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDimensions (H × W × D):\u003c\/b\u003e 6.5\" x 19\" x 13.7\" (13.7 x 48 x 34.8 cm); handles extend 1.6\" (4 cm) forward of the front panel\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eShipping Weight:\u003c\/b\u003e 23.5 lb. (10.7 kg)\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eWeight:\u003c\/b\u003e 15.4 lb. (7 kg)\u003c\/p\u003e\n","brand":"Audio Research","offers":[{"title":"Black","offer_id":53876968161464,"sku":"ARC-PH9-BLK","price":12000.0,"currency_code":"USD","in_stock":true},{"title":"Natural (Silver)","offer_id":53876968194232,"sku":"ARC-PH9-NAT","price":12000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/files\/PH9frontnathires.jpg?v=1787612216"},{"product_id":"audio-research-reference-160m-mkii-monoblock-poweramplifier-each","title":"Audio Research Reference 160M MkII Monoblock Poweramplifier (each)","description":"\u003ch1\u003eAudio Research Reference 160M MkII Monoblock Power Amplifier\u003c\/h1\u003e\n\u003ch3\u003e140 Watts of Reference-Series Tube Power With Switchable Ultralinear\/Triode Operation, Auto-Bias, and the Signature GhostMeter\u003c\/h3\u003e\n\u003cp\u003eThe Reference 160M MkII is a central pillar of Audio Research's Reference amplifier range, combining 140 W of continuous monoblock power with a refined signal path, switchable Ultralinear\/Triode operation, proprietary auto-bias, and comprehensive output-tube monitoring and protection.\u003c\/p\u003e\n\u003cp\u003eEach monoblock uses four KT150 output tubes, while a newly developed High Energy Capacity Transformer and substantial bulk storage-capacity network are designed to provide high current on demand. Audio Research's approach pairs this robust power supply with a deliberately short audio path built around a four-layer circuit board and selected high-grade and custom components.\u003c\/p\u003e\n\u003ch4\u003eUltralinear or Triode Operation\u003c\/h4\u003e\n\u003cp\u003eThe Reference 160M MkII allows the user to switch between Ultralinear and Triode operation, providing two distinct operating choices from the same amplifier. The feature is integrated into the amplifier's broader control and protection architecture rather than requiring manual reconfiguration of the output stage.\u003c\/p\u003e\n\u003ch4\u003eAutomatic Tube Bias\u003c\/h4\u003e\n\u003cp\u003eAudio Research's proprietary auto-bias circuit continuously maintains output-tube bias and compensates as the tubes wear, eliminating routine manual bias adjustment. In addition to the supplied KT150 output tubes, the circuit is designed to work with 6550, KT88, and KT120 tube types.\u003c\/p\u003e\n\u003ch4\u003eGhostMeter Display\u003c\/h4\u003e\n\u003cp\u003eThe distinctive GhostMeter provides a clear view of the output tubes while incorporating a power-output meter directly into the front-panel presentation. Etched markings form part of the integrated display, and its brightness is adjustable to suit the room.\u003c\/p\u003e\n\u003ch4\u003eHigh-Energy Power Supply and Short Signal Path\u003c\/h4\u003e\n\u003cp\u003eThe power supply incorporates Audio Research's High Energy Capacity Transformer and a large bulk storage-capacity network intended to provide the current reserves required for demanding transient peaks. A four-layer circuit board supports the amplifier's short signal path and its selection of high-grade and custom-made components.\u003c\/p\u003e\n\u003cp\u003eThe Reference 160M MkII is available in Natural (Silver) or Black finishes.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e140 W continuous monoblock output from 20 Hz–20 kHz\u003c\/li\u003e\n\u003cli\u003eSwitchable Ultralinear\/Triode operation\u003c\/li\u003e\n\u003cli\u003eProprietary automatic output-tube bias system\u003c\/li\u003e\n\u003cli\u003eOutput-tube monitoring and protection\u003c\/li\u003e\n\u003cli\u003eFour KT150 output tubes per monoblock\u003c\/li\u003e\n\u003cli\u003eCompatible with 6550, KT88, and KT120 output tubes through the auto-bias system\u003c\/li\u003e\n\u003cli\u003eHigh Energy Capacity Transformer with substantial bulk storage capacity\u003c\/li\u003e\n\u003cli\u003eFour-layer circuit board supporting a short signal path\u003c\/li\u003e\n\u003cli\u003eGhostMeter with integrated power-output display and adjustable brightness\u003c\/li\u003e\n\u003cli\u003eBalanced and single-ended inputs\u003c\/li\u003e\n\u003cli\u003e4-, 8-, and 16-ohm output taps\u003c\/li\u003e\n\u003cli\u003eAvailable in Natural (Silver) or Black finishes\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003ePower Output:\u003c\/b\u003e 140 W continuous from 20 Hz–20 kHz\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eTotal Harmonic Distortion (1 kHz):\u003c\/b\u003e Typically 1% at 140 W; below 0.04% at 1 W\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePower Bandwidth (-3 dB Points):\u003c\/b\u003e 5 Hz–70 kHz\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eFrequency Response (-3 dB Points at 1 W):\u003c\/b\u003e 0.5 Hz–110 kHz\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eInput Sensitivity:\u003c\/b\u003e 2.4 V RMS balanced for rated output; 25.5 dB gain into 8 ohms\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eInput Impedance:\u003c\/b\u003e 200k ohms balanced; 100k ohms single-ended\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eOutput Polarity:\u003c\/b\u003e Non-inverting; balanced input pin 2+ (IEC-268)\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eOutput Taps:\u003c\/b\u003e 4, 8, 16 ohms\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eOutput Regulation:\u003c\/b\u003e Approximately 0.6 dB, 16-ohm load to open circuit; damping factor approximately 14\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eOverall Negative Feedback:\u003c\/b\u003e 14 dB\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eSlew Rate:\u003c\/b\u003e 13 V\/microsecond\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eRise Time:\u003c\/b\u003e 2 microseconds\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePower Requirements per Monoblock (US):\u003c\/b\u003e 105–130 VAC, 60 Hz; 400 W at rated output, 700 W maximum, 260 W at idle, 1 W off\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eOutput Tubes per Monoblock:\u003c\/b\u003e 2 matched pairs KT150 (V1–V4)\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDimensions (H × W × D):\u003c\/b\u003e 10\" x 17.25\" x 18.5\" (25.4 x 43.8 x 47 cm)\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDepth With Handles Extended:\u003c\/b\u003e 19.25\" (48.9 cm)\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eShipping Weight per Monoblock:\u003c\/b\u003e 73 lb. (33.2 kg)\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eWeight per Monoblock:\u003c\/b\u003e 56 lb. (25.5 kg)\u003c\/p\u003e\n","brand":"Audio Research","offers":[{"title":"Black","offer_id":53876968390840,"sku":"ARC-REF160M-BLK","price":22500.0,"currency_code":"USD","in_stock":true},{"title":"Natural (Silver)","offer_id":53876968423608,"sku":"ARC-REF160M-NAT","price":22500.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/files\/Ref160frontcoverBLKfull.jpg?v=1786385337"},{"product_id":"audio-research-reference-160s-stereo-poweramplifier","title":"Audio Research Reference 160S Stereo Poweramplifier","description":"\u003ch1\u003eAudio Research Reference 160S Stereo Power Amplifier\u003c\/h1\u003e\n\u003ch3\u003e140 Wpc Ultralinear or 70 Wpc Triode Operation With Auto-Bias, Dual GhostMeters, and Eight KT150 Output Tubes\u003c\/h3\u003e\n\u003cp\u003eThe Audio Research Reference 160S brings the architecture and feature set developed for the REF160M monoblock into a single stereo chassis. Its fully balanced circuit topology uses eight KT150 output tubes and four 6H30 gain-stage tubes, delivering approximately 140 Wpc in Ultralinear mode or 70 Wpc in Triode mode.\u003c\/p\u003e\n\u003cp\u003eThe 160S gives you more than one way to integrate it into a serious system. Balanced XLR and single-ended RCA inputs accommodate a wide range of preamplifiers, while dedicated 4-, 8-, and 16-ohm output taps provide appropriate connections for different loudspeaker loads. A 12 V trigger and RS-232 interface support remote and system-control installations.\u003c\/p\u003e\n\u003ch4\u003eUltralinear or Triode at the Touch of a Button\u003c\/h4\u003e\n\u003cp\u003eA front-panel control switches the Reference 160S between Ultralinear and Triode operation. Ultralinear mode provides approximately 140 Wpc, while Triode mode provides approximately 70 Wpc, allowing the owner to choose between the two operating modes without changing tubes or making internal adjustments.\u003c\/p\u003e\n\u003ch4\u003eAutomatic Bias Control\u003c\/h4\u003e\n\u003cp\u003eAudio Research's auto-bias circuit eliminates routine manual bias adjustment. Once factory-set, the circuit continually compensates to maintain the proper bias as the KT150 output tubes age. A front-panel Tube Monitor function provides a convenient way to check the operating status of all eight output tubes.\u003c\/p\u003e\n\u003ch4\u003eDual GhostMeters\u003c\/h4\u003e\n\u003cp\u003eDual GhostMeters place the power-meter displays in front of the eight KT150 output tubes, giving the 160S the distinctive visual architecture introduced with the REF160M. Meter illumination can be adjusted through four brightness levels, including off.\u003c\/p\u003e\n\u003ch4\u003eDesigned for Real-World System Integration\u003c\/h4\u003e\n\u003cp\u003eThe Reference 160S includes selectable balanced or single-ended operation, switchable high\/low fan speed, and a defeatable auto-shutoff function that turns the amplifier off after two hours without a detected signal. Two internal fans provide forced-air cooling, while the rear panel includes 12 V trigger connections and RS-232 control for integration with automated systems.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e140 Wpc continuous output from 20 Hz–20 kHz in Ultralinear operation\u003c\/li\u003e\n\u003cli\u003eApproximately 70 Wpc in Triode operation\u003c\/li\u003e\n\u003cli\u003eEight matched KT150 output tubes and four matched 6H30 gain-stage tubes\u003c\/li\u003e\n\u003cli\u003eFully balanced circuit topology\u003c\/li\u003e\n\u003cli\u003eProprietary automatic bias circuit with continuous compensation as output tubes age\u003c\/li\u003e\n\u003cli\u003eSwitchable Ultralinear and Triode operating modes\u003c\/li\u003e\n\u003cli\u003eDual GhostMeter power meters\u003c\/li\u003e\n\u003cli\u003eOutput-tube monitoring for all eight KT150 tubes\u003c\/li\u003e\n\u003cli\u003eBalanced XLR and single-ended RCA inputs\u003c\/li\u003e\n\u003cli\u003e4-, 8-, and 16-ohm speaker output taps\u003c\/li\u003e\n\u003cli\u003eFour-level meter illumination adjustment, including off\u003c\/li\u003e\n\u003cli\u003eSelectable high\/low fan speed\u003c\/li\u003e\n\u003cli\u003eDefeatable two-hour auto-shutoff\u003c\/li\u003e\n\u003cli\u003e12 V trigger input\/output and RS-232 control\u003c\/li\u003e\n\u003cli\u003eFour-layer circuit board\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eIncluded Accessories\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eEight matched KT150 output tubes\u003c\/li\u003e\n\u003cli\u003eFour matched 6H30 tubes\u003c\/li\u003e\n\u003cli\u003e20 A IEC 12-gauge AC power cord\u003c\/li\u003e\n\u003cli\u003e7\/64\" hex driver for initial tube-cage removal\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003ePower Output:\u003c\/b\u003e 140 Wpc continuous from 20 Hz–20 kHz; 1 kHz total harmonic distortion typically 1% at 140 W, below 0.04% at 1 W; approximately 70 Wpc in Triode mode\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePower Bandwidth (-3 dB Points):\u003c\/b\u003e 5 Hz–70 kHz\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eFrequency Response (-3 dB Points at 1 W):\u003c\/b\u003e 0.5 Hz–110 kHz\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eInput Sensitivity:\u003c\/b\u003e 2.4 V RMS balanced for rated output; 25.5 dB gain into 8 ohms\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eInput Impedance:\u003c\/b\u003e 300k ohms balanced; 100k ohms single-ended\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eOutput Polarity:\u003c\/b\u003e Non-inverting; balanced input pin 2+ (IEC-268)\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eOutput Taps:\u003c\/b\u003e 4, 8, and 16 ohms\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eOutput Regulation:\u003c\/b\u003e Approximately 0.6 dB, 16-ohm load to open circuit; damping factor approximately 14\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eOverall Negative Feedback:\u003c\/b\u003e 14 dB\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eSlew Rate:\u003c\/b\u003e 13 V\/microsecond\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eRise Time:\u003c\/b\u003e 2 microseconds\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePower Requirements:\u003c\/b\u003e 105–130 VAC, 60 Hz; 875 W at rated output, 700 W in Triode mode, 500 W at idle, 3.6 W off\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eTubes Required:\u003c\/b\u003e Eight KT150 output tubes (four matched pairs); four 6H30 gain-stage tubes\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDimensions (H × W × D):\u003c\/b\u003e 10.25\" x 19\" x 21.5\" (26 x 48.26 x 54.61 cm); 24\" (60.96 cm) deep with handles and connectors\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eWeight:\u003c\/b\u003e 100 lb. (45.4 kg)\u003c\/p\u003e\n","brand":"Audio Research","offers":[{"title":"Black","offer_id":53876968456376,"sku":"ARC-REF160S-BLK","price":28000.0,"currency_code":"USD","in_stock":true},{"title":"Natural (Silver)","offer_id":53876968489144,"sku":"ARC-REF160S-NAT","price":28000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/files\/Ref160SanglenocoverBLK.jpg?v=1786382782"},{"product_id":"audio-research-reference-20-linestage-preamplifier","title":"Audio Research Reference 20 Linestage Preamplifier","description":"\u003ch1\u003eAudio Research Reference 20 Line-Stage Preamplifier\u003c\/h1\u003e\n\u003ch3\u003eAudio Research’s New Flagship Combines an All-New Mechanical Architecture With a Redesigned Power Supply in a Single Chassis\u003c\/h3\u003e\n\u003cp\u003eThe Reference 20 is Audio Research’s new flagship line-stage preamplifier, developed from the ground up to advance beyond the company’s previous Reference designs. Rather than refining an existing platform, Audio Research reconsidered the mechanical structure, electrical architecture, materials, and power supply together, with the stated goal of achieving greater transparency while preserving the qualities that have defined its Reference preamplifiers.\u003c\/p\u003e\n\u003cp\u003eOne of the most significant changes is immediately apparent: the Reference 20 places its circuitry and power supply in a single chassis. It replaces the two-chassis architecture of its predecessor with a new construction that Audio Research says surpasses the earlier design while reducing the physical complexity of a reference-level system.\u003c\/p\u003e\n\u003ch4\u003eAn All-New Mechanical Architecture\u003c\/h4\u003e\n\u003cp\u003eInstead of a conventional stamped chassis, the Reference 20 uses a layered, multi-metal construction engineered to control and disperse resonant energy. Critical circuitry is mounted to custom suspended, mass-loaded boards, further isolating the signal path from mechanical vibration.\u003c\/p\u003e\n\u003cp\u003eThis approach treats the chassis as an active part of the preamplifier’s engineering rather than simply an enclosure. By controlling resonance both at the chassis and circuit-board levels, Audio Research aims to preserve low-level information and spatial detail that can otherwise be obscured by mechanical interference.\u003c\/p\u003e\n\u003ch4\u003eA Completely Redesigned Power Supply\u003c\/h4\u003e\n\u003cp\u003eThe Reference 20 also introduces a comprehensively redesigned power supply focused on lower noise and improved reliability. Advanced regulation is combined with newer component technologies, including next-generation film capacitors. Audio Research states that these changes reduce noise on the regulated power-supply rails by an order of magnitude.\u003c\/p\u003e\n\u003cp\u003eLowering the electrical noise floor is particularly important in a line-stage preamplifier, where very small signals must be amplified without obscuring fine information. Audio Research attributes the Reference 20’s increased resolving ability, dynamic articulation, and transparency in part to this substantially quieter power architecture.\u003c\/p\u003e\n\u003ch4\u003eA New Reference for Audio Research\u003c\/h4\u003e\n\u003cp\u003eThe Reference 20 represents the latest step in a lineage that includes landmark Audio Research preamplifiers such as the SP-3 and Reference 1. According to Audio Research, the cumulative effect of the new mechanical platform, circuit implementation, materials, and power supply goes beyond an incremental update, delivering improvements in dimensionality, tonal integrity, timing coherence, and dynamic expression over its previous reference designs.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFlagship Audio Research Reference-series line-stage preamplifier\u003c\/li\u003e\n\u003cli\u003eAll-new line-stage platform developed from the ground up\u003c\/li\u003e\n\u003cli\u003eSingle-chassis architecture replacing the previous two-chassis flagship design\u003c\/li\u003e\n\u003cli\u003eLayered, multi-metal chassis construction engineered to disperse and control resonant energy\u003c\/li\u003e\n\u003cli\u003eCustom suspended, mass-loaded circuit boards for additional mechanical isolation\u003c\/li\u003e\n\u003cli\u003eComprehensively redesigned power supply\u003c\/li\u003e\n\u003cli\u003eAdvanced power-supply regulation designed for lower noise and improved reliability\u003c\/li\u003e\n\u003cli\u003eNext-generation film capacitors used in the power-supply architecture\u003c\/li\u003e\n\u003cli\u003eRegulated-rail noise reduced by an order of magnitude according to Audio Research\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Audio Research","offers":[{"title":"Black","offer_id":53876968685752,"sku":"ARC-REF20-BLK","price":48000.0,"currency_code":"USD","in_stock":true},{"title":"Natural (Silver)","offer_id":53876968718520,"sku":"ARC-REF20-NAT","price":48000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/files\/Ref20-black-main.jpg?v=1787609888"},{"product_id":"audio-research-reference-330m-monoblock-poweramplifier-each","title":"Audio Research Reference 330M Monoblock Poweramplifier (each)","description":"\u003ch1\u003eAudio Research Reference 330M Monoblock Power Amplifier\u003c\/h1\u003e\n\u003ch3\u003e330 W of Fully Balanced, All-Tube Reference Power With Automatic Bias and KT170 Output Tubes\u003c\/h3\u003e\n\u003cp\u003eThe Reference 330M is Audio Research's flagship monoblock power amplifier and the culmination of more than 50 years of vacuum-tube amplifier design. Rated at 330 W, it combines substantial output capability with an all-tube signal path, beginning with an ECC83 input stage and culminating in six KT170 output tubes per monoblock.\u003c\/p\u003e\n\u003cp\u003eAudio Research describes the Reference 330M as the finest amplifier it has created. Its architecture combines a fully balanced circuit with tube regulation in the power supply, while both balanced XLR and single-ended inputs make it practical to integrate into a wide range of reference systems. Separate 4-ohm and 8-ohm output taps accommodate different loudspeaker loads.\u003c\/p\u003e\n\u003ch4\u003eHigh Power Without the Usual Tube-Amp Fuss\u003c\/h4\u003e\n\u003cp\u003eAutomatic bias continuously maintains the output tubes' operating conditions, eliminating routine manual bias adjustment. Audio Research specifies output-tube life at 3,000 hours, while an onboard tube-hour meter and tube-monitoring system help owners keep track of operation and maintenance.\u003c\/p\u003e\n\u003cp\u003eThe Reference 330M also provides adjustable fan speed, meter illumination that can be dimmed or switched off, and a meter-action control that can stop the meter needle when desired. A defeatable auto-off function shuts down the amplifier after two hours without a detected signal.\u003c\/p\u003e\n\u003ch4\u003eBuilt for Integrated Reference Systems\u003c\/h4\u003e\n\u003cp\u003eFor system control, the Reference 330M provides 12 V trigger operation and RS-232 control. The trigger input allows the amplifier to power up along with a Reference preamplifier or compatible master-control system, while standby mode provides a convenient power-saving state.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e330 W monoblock power output\u003c\/li\u003e\n\u003cli\u003eFully balanced amplifier design with an all-tube signal path\u003c\/li\u003e\n\u003cli\u003eSix KT170 output tubes per monoblock\u003c\/li\u003e\n\u003cli\u003eECC83 and 6H30 input tubes\u003c\/li\u003e\n\u003cli\u003e6550 and 6H30 tubes in the power supply\u003c\/li\u003e\n\u003cli\u003eAutomatic tube biasing\u003c\/li\u003e\n\u003cli\u003e3,000-hour specified output-tube life\u003c\/li\u003e\n\u003cli\u003eBalanced XLR and single-ended inputs\u003c\/li\u003e\n\u003cli\u003e4-ohm and 8-ohm speaker output taps\u003c\/li\u003e\n\u003cli\u003e12 V trigger control\u003c\/li\u003e\n\u003cli\u003eRS-232 control\u003c\/li\u003e\n\u003cli\u003eDefeatable two-hour auto-off function\u003c\/li\u003e\n\u003cli\u003eAdjustable fan speed\u003c\/li\u003e\n\u003cli\u003eTube-hour meter and tube monitoring\u003c\/li\u003e\n\u003cli\u003eAdjustable meter illumination\u003c\/li\u003e\n\u003cli\u003eSwitchable meter-needle action\u003c\/li\u003e\n\u003cli\u003eStandby mode\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003ePower Output:\u003c\/b\u003e 330 W\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eTube Biasing:\u003c\/b\u003e Automatic bias\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eOutput Taps:\u003c\/b\u003e 4 ohms, 8 ohms\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePower Output Tubes:\u003c\/b\u003e (6) KT170\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eInput Tubes:\u003c\/b\u003e (1) ECC83, (1) 6H30\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePower Supply Tubes:\u003c\/b\u003e (1) 6550, (1) 6H30\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eInputs:\u003c\/b\u003e XLR, single-ended\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eControls:\u003c\/b\u003e 12 V triggers, RS-232 remote control\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePower Saving:\u003c\/b\u003e Standby mode\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eWeight:\u003c\/b\u003e 101 lb. (45.8 kg)\u003c\/p\u003e","brand":"Audio Research","offers":[{"title":"Black","offer_id":53876968751288,"sku":"ARC-REF330M-BLK","price":45000.0,"currency_code":"USD","in_stock":true},{"title":"Natural (Silver)","offer_id":53876968784056,"sku":"ARC-REF330M-NAT","price":45000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/files\/330M-launch-image-front.jpg?v=1787611203"},{"product_id":"audio-research-reference-7-linestage-preamplifier","title":"Audio Research Reference 7 Linestage Preamplifier","description":"\u003ch1\u003eAudio Research Reference 7 Line-Stage Preamplifier\u003c\/h1\u003e\n\u003ch3\u003eReference 20-derived architecture, a new multi-metal chassis, and solid-state regulation bring Audio Research’s latest Reference platform to a single-chassis line stage\u003c\/h3\u003e\n\u003cp\u003eThe Reference 7 represents a new generation of Audio Research line-stage preamplifiers. Rather than evolving the previous Reference 6SE, it was developed from the same ground-up platform that produced the flagship Reference 20, bringing key elements of that design into a more compact single-chassis component.\u003c\/p\u003e\n\u003cp\u003eAudio Research positions the Reference 7 directly below the Reference 20 and says its new architecture advances performance beyond the company’s previous flagship preamplifier. Its design centers on mechanical isolation, lower noise, and careful control of resonance, with two 6H30P dual triodes providing the active tube complement.\u003c\/p\u003e\n\u003ch4\u003eReference 20-Derived Mechanical Architecture\u003c\/h4\u003e\n\u003cp\u003eThe Reference 7 shares the fundamental mechanical architecture developed for the Reference 20. Its layered, multi-metal chassis is designed to manage resonance through controlled energy distribution, while suspended, mass-loaded circuit boards further isolate the circuitry from unwanted mechanical energy.\u003c\/p\u003e\n\u003cp\u003eThese measures are intended to protect the integrity of the signal path rather than simply adding mass to the enclosure. The result is a substantially different physical platform from the preceding generation of Audio Research Reference preamplifiers.\u003c\/p\u003e\n\u003ch4\u003eLower-Noise Power Regulation\u003c\/h4\u003e\n\u003cp\u003eAudio Research redesigned the Reference 7 power supply with an emphasis on reducing the noise floor and improving long-term stability. Solid-state regulation replaces the previous approach, combining low-noise operation with increased reliability.\u003c\/p\u003e\n\u003cp\u003eReference-grade output coupling capacitors derived from the Reference 20 are also incorporated into the signal path. Audio Research says the combination of the new mechanical platform, power regulation, and selected components allows the Reference 7 to increase resolution while retaining the texture and musical coherence expected from a Reference-series line stage.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSingle-chassis Reference-series line-stage preamplifier\u003c\/li\u003e\n\u003cli\u003eDerived from the ground-up development platform of the flagship Reference 20\u003c\/li\u003e\n\u003cli\u003eLayered, multi-metal chassis engineered to manage mechanical resonance\u003c\/li\u003e\n\u003cli\u003eSuspended, mass-loaded circuit boards for additional circuit isolation\u003c\/li\u003e\n\u003cli\u003eSolid-state power-supply regulation designed for low noise and long-term stability\u003c\/li\u003e\n\u003cli\u003eReference-grade output coupling capacitors derived from the Reference 20 design\u003c\/li\u003e\n\u003cli\u003eTwo 6H30P dual-triode tubes\u003c\/li\u003e\n\u003cli\u003e12 dB gain from both balanced and single-ended main outputs\u003c\/li\u003e\n\u003cli\u003eBalanced and single-ended connectivity\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003eTube Complement:\u003c\/b\u003e (2) 6H30P dual triodes\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eFrequency Response (At Rated Output, Balanced, 100 kΩ Load):\u003c\/b\u003e -0.3 dB at 10 Hz, -0.3 dB at 40 kHz\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eTHD + Noise (2 V RMS Balanced Output, 10 Hz–80 kHz, Unweighted):\u003c\/b\u003e \u0026lt;0.03%\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eMain Output Gain:\u003c\/b\u003e 12 dB balanced, 12 dB single-ended\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eInput Impedance:\u003c\/b\u003e 25 kΩ balanced, 25 kΩ single-ended\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eOutput Impedance:\u003c\/b\u003e 600 Ω balanced, 375 Ω single-ended\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eCrosstalk (1 kHz):\u003c\/b\u003e -76 dB or better\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePower Requirements (US):\u003c\/b\u003e 100–135 V AC, 60 Hz, 60 W maximum\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eStandby Power Consumption:\u003c\/b\u003e 4.4 W\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDimensions (W × H × D):\u003c\/b\u003e 19\" x 7\" x 17.5\" (483 x 178 x 445 mm), including knobs and rear bumpers\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eWeight:\u003c\/b\u003e 33 lb. (15 kg)\u003c\/p\u003e\n","brand":"Audio Research","offers":[{"title":"Black","offer_id":53876968980664,"sku":"ARC-REF7-BLK","price":28000.0,"currency_code":"USD","in_stock":true},{"title":"Natural (Silver)","offer_id":53876969013432,"sku":"ARC-REF7-NAT","price":28000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/files\/Ref7-black-front.jpg?v=1786380635"},{"product_id":"audio-research-s-100-stereo-power-amplifier","title":"Audio Research S-100 Stereo Power Amplifier","description":"\u003ch1\u003eAudio Research S-100 Stereo Power Amplifier\u003c\/h1\u003e\n\u003ch3\u003e100 Wpc, Dual-Mono Construction, and Fully Balanced Circuitry in Audio Research’s Most Accessible S-Series Power Amplifier\u003c\/h3\u003e\n\u003cp\u003eThe Audio Research S-100 brings the company’s latest solid-state amplifier platform to a more compact, lower-powered design. Rated at 100 Wpc into 8 ohms and 200 Wpc into 4 ohms, it combines substantial current capability with the engineering priorities Audio Research has developed through decades of both solid-state and tube amplifier design.\u003c\/p\u003e\n\u003cp\u003eLike the larger S-200, the S-100 is a class-AB amplifier built on a dual-mono platform. Dual toroidal transformers support its ability to double rated output into 4 ohms, while the stereo circuit is fully balanced. Audio Research also specifies bipolar output transistors rather than MOSFETs, a choice the company attributes to their purity, transparency, and dynamic performance.\u003c\/p\u003e\n\u003ch4\u003eModern S-Series Construction\u003c\/h4\u003e\n\u003cp\u003eThe S-100 uses a machined aluminum chassis available in black or silver anodized finishes. Its industrial design retains recognizable Audio Research cues while taking a cleaner, more contemporary approach, including custom-machined heat sinks and no visible fasteners from the front or top.\u003c\/p\u003e\n\u003ch4\u003eBuilt and Evaluated in Minnesota\u003c\/h4\u003e\n\u003cp\u003eAudio Research describes the S-100 and S-200 as its latest and most advanced solid-state amplifier designs. Following measurement and bench testing, each amplifier is also evaluated by ear in keeping with the company’s longstanding development process. S-Series amplifiers are produced at Audio Research’s Minnesota facility alongside its Reference tube amplifiers.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e100 Wpc into 8 ohms and 200 Wpc into 4 ohms\u003c\/li\u003e\n\u003cli\u003eClass-AB operation\u003c\/li\u003e\n\u003cli\u003eDual-mono architecture with dual toroidal transformers\u003c\/li\u003e\n\u003cli\u003eFully balanced stereo circuit\u003c\/li\u003e\n\u003cli\u003eBipolar transistor design\u003c\/li\u003e\n\u003cli\u003eBalanced and single-ended input capability\u003c\/li\u003e\n\u003cli\u003eMachined aluminum chassis\u003c\/li\u003e\n\u003cli\u003eCustom-machined heat sinks\u003c\/li\u003e\n\u003cli\u003eBlack or silver anodized finish\u003c\/li\u003e\n\u003cli\u003eMade at Audio Research’s Minnesota facility\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003ePower Output:\u003c\/b\u003e 100 Wpc into 8 ohms; 200 Wpc into 4 ohms\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eTotal Harmonic Distortion (1 kHz, 8 Ohms):\u003c\/b\u003e \u0026lt;0.1% from 0.25 W to rated output\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eBalanced Input Sensitivity:\u003c\/b\u003e 1.4 V RMS for rated output\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eInput Impedance:\u003c\/b\u003e 100 kΩ balanced or single-ended\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eGain:\u003c\/b\u003e 26 dB\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eInput Sensitivity:\u003c\/b\u003e 1.8 V RMS for rated output\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eNoise:\u003c\/b\u003e \u0026lt;60 µV output\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eFrequency Response:\u003c\/b\u003e ±0.1 dB, 20 Hz–20 kHz\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePower Requirements (120 VAC):\u003c\/b\u003e 0.25 W standby; 48 W on at idle; 475 W at rated output\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDimensions (W × H × D):\u003c\/b\u003e 19\" × 7\" × 17.5\" (482.6 × 177.8 × 444.5 mm)\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eShipping Weight:\u003c\/b\u003e 63 lb. (28.5 kg)\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eWeight:\u003c\/b\u003e 41 lb. (19 kg)\u003c\/p\u003e\n","brand":"Audio Research","offers":[{"title":"Black","offer_id":53876969603256,"sku":"ARC-S100-BLK","price":9450.0,"currency_code":"USD","in_stock":true},{"title":"Natural (Silver)","offer_id":53876969636024,"sku":"ARC-S100-NAT","price":9450.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/files\/S-100-front-web.jpg?v=1786387388"},{"product_id":"audio-research-s-200-stereo-power-amplifier","title":"Audio Research S-200 Stereo Power Amplifier","description":"\u003ch1\u003eAudio Research S-200 Stereo Power Amplifier\u003c\/h1\u003e\n\u003ch3\u003e200 Wpc, True Dual-Mono Construction, and Fully Balanced Circuitry in Audio Research’s Solid-State S Series\u003c\/h3\u003e\n\u003cp\u003eThe Audio Research S-200 is a 200-watt-per-channel stereo power amplifier and one of the company’s latest solid-state designs. A pure class-AB amplifier, it combines a linear power supply with true dual-mono construction, using two toroidal transformers to feed fully balanced stereo circuits.\u003c\/p\u003e\n\u003cp\u003eRated power doubles from 200 Wpc into 8 ohms to 400 Wpc into 4 ohms, giving the S-200 substantial output for demanding loudspeaker systems. Audio Research chose bipolar output transistors rather than MOSFETs, citing their purity, transparency, and dynamic performance as reasons for the design choice.\u003c\/p\u003e\n\u003ch4\u003eDual-Mono Architecture\u003c\/h4\u003e\n\u003cp\u003eBeyond the shared AC input, the S-200 is built around a dual-mono platform with separate toroidal power transformers. The amplifier's balanced circuit architecture continues Audio Research's long-standing emphasis on fully balanced designs while bringing that approach to the company's newest generation of solid-state amplification.\u003c\/p\u003e\n\u003ch4\u003eA New Look for Audio Research\u003c\/h4\u003e\n\u003cp\u003eThe S-200's machined aluminum chassis is available in black or silver anodized finishes. Custom-machined heat sinks and the absence of visible fasteners on the front and top give the amplifier a cleaner, more contemporary interpretation of classic Audio Research industrial design.\u003c\/p\u003e\n\u003cp\u003eFront-panel power-output meters follow the style of Audio Research's current meter designs, using a solid black background rather than the transparent Ghost Meters found on the company's Reference amplifiers.\u003c\/p\u003e\n\u003ch4\u003eBuilt in Minnesota\u003c\/h4\u003e\n\u003cp\u003eAudio Research builds its S Series amplifiers at its Minnesota facility alongside its Reference tube amplifiers. Following measurement and bench testing, each amplifier is also evaluated by ear as part of the company's established production process.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e200 Wpc into 8 ohms and 400 Wpc into 4 ohms\u003c\/li\u003e\n\u003cli\u003ePure class-AB amplifier design\u003c\/li\u003e\n\u003cli\u003eTrue dual-mono architecture\u003c\/li\u003e\n\u003cli\u003eDual toroidal power transformers\u003c\/li\u003e\n\u003cli\u003eFully balanced stereo circuitry\u003c\/li\u003e\n\u003cli\u003eBipolar output transistors\u003c\/li\u003e\n\u003cli\u003eBalanced and single-ended inputs\u003c\/li\u003e\n\u003cli\u003eFront-panel power-output meters\u003c\/li\u003e\n\u003cli\u003eMachined aluminum chassis with custom-machined heat sinks\u003c\/li\u003e\n\u003cli\u003eBlack or silver anodized finish\u003c\/li\u003e\n\u003cli\u003eManufactured at Audio Research's Minnesota facility\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003ePower Output:\u003c\/b\u003e 200 Wpc into 8 ohms; 400 Wpc into 4 ohms\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eTHD (1 kHz, 8 Ohms):\u003c\/b\u003e \u0026lt;0.1% from 0.25 W to rated output\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eInput Sensitivity:\u003c\/b\u003e 1.8 V RMS for rated output\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eInput Impedance:\u003c\/b\u003e 100 kΩ, balanced or single-ended\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eGain:\u003c\/b\u003e Non-inverting; balanced input pin 2+ (IEC-268)\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eNoise:\u003c\/b\u003e 100 dB\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eFrequency Response:\u003c\/b\u003e ±0.1 dB, 20 Hz–20 kHz\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDamping Factor:\u003c\/b\u003e 300, 20 Hz–1 kHz\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePower Requirements (120 V AC):\u003c\/b\u003e 0.25 W standby; 48 W on at idle; 475 W at rated output\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDimensions (H × W × D):\u003c\/b\u003e 7\" × 19\" × 17.5\" (17.78 × 48.26 × 44.45 cm)\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eShipping Weight:\u003c\/b\u003e 63 lb. (28.5 kg)\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eWeight:\u003c\/b\u003e 41 lb. (19 kg)\u003c\/p\u003e","brand":"Audio Research","offers":[{"title":"Black","offer_id":53876969734328,"sku":"ARC-S200-BLK","price":12950.0,"currency_code":"USD","in_stock":true},{"title":"Natural (Silver)","offer_id":53876969767096,"sku":"ARC-S200-NAT","price":12950.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/files\/S-200-front.jpg?v=1786386716"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/collections\/LS3-silver-front.jpg?v=1786390322","url":"https:\/\/upscaleaudio.com\/collections\/audio-research.oembed","provider":"Upscale Audio","version":"1.0","type":"link"}