{"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","url":"https:\/\/upscaleaudio.com\/products\/audio-research-ls-2-preamplifier","provider":"Upscale Audio","version":"1.0","type":"link"}