{"product_id":"grimm-audio-pa1-monoblock-power-amplifier-pair","title":"Grimm Audio PA1 Monoblock Power Amplifier (pair)","description":"\u003ch1\u003eGrimm Audio PA1 Monoblock Power Amplifier\u003c\/h1\u003e\n\u003ch3\u003eWide-bandwidth class-AB circuitry, 200 W into 4 ohms, and exceptionally low dynamic distortion\u003c\/h3\u003e\n\u003cp\u003eThe Grimm Audio PA1 is a compact monoblock power amplifier designed to minimize forms of dynamic distortion that conventional measurements can overlook. Its fully symmetrical class-AB circuit delivers more than 150 W into 8 ohms and more than 200 W into 4 ohms, with the current capability and low output impedance required to maintain control over demanding loudspeakers.\u003c\/p\u003e\n\u003cp\u003eThe PA1’s output stage is an evolution of a circuit developed by the late Henk ten Pierick in 1985. Its name stands for “Pierick Amp.” The design uses 96 small, fast power transistors mounted on an aluminum circuit board that provides extremely close thermal coupling between the output devices and their driver circuit. This arrangement maintains a stable operating point as loudspeaker current and transistor temperature change, minimizing residual crossover distortion and other errors that vary with the music signal.\u003c\/p\u003e\n\u003ch4\u003eDesigned for Low Dynamic Distortion\u003c\/h4\u003e\n\u003cp\u003eDedicated circuit techniques, including feed-forward correction, reduce phase modulation throughout the PA1’s power and signal stages. Grimm Audio then applies a carefully designed second-order feedback loop to address the small amount of distortion that remains. The result is a measured total harmonic distortion of less than 0.0001% and a damping factor greater than 800 into 8 ohms.\u003c\/p\u003e\n\u003cp\u003eThe input signal path contains no series coupling capacitors, while multilayer circuit boards keep critical signal paths short. The protection system is designed without placing relay contacts in series with the amplified output signal. A large Amplimo toroidal transformer and 90,000 µF of power-supply capacitance provide ample current, while separate local regulation isolates the driver and feedback circuitry from changes in loudspeaker demand.\u003c\/p\u003e\n\u003ch4\u003eFlexible Gain and Automatic Operation\u003c\/h4\u003e\n\u003cp\u003eThe PA1 provides balanced XLR and unbalanced RCA inputs, selected by a rear-panel switch. Its standard 26 dB gain setting suits most preamplifiers, while the 18 dB setting accommodates high-output preamplifiers, professional converters, and systems using high-sensitivity loudspeakers.\u003c\/p\u003e\n\u003cp\u003eA selectable automatic power mode switches the PA1 on when it detects an input signal and returns it to low-power standby after approximately 40 minutes of silence. Thermal, DC-offset, short-circuit, and clipping protection help safeguard the amplifier and connected loudspeakers.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFully symmetrical class-AB monoblock design\u003c\/li\u003e\n\u003cli\u003eMore than 150 W into 8 ohms and 200 W into 4 ohms\u003c\/li\u003e\n\u003cli\u003e96 fast output transistors mounted on an aluminum circuit board\u003c\/li\u003e\n\u003cli\u003eClose thermal coupling minimizes residual crossover distortion\u003c\/li\u003e\n\u003cli\u003eFeed-forward correction reduces phase modulation\u003c\/li\u003e\n\u003cli\u003eSecond-order global feedback circuit\u003c\/li\u003e\n\u003cli\u003eNo series coupling capacitors in the input signal path\u003c\/li\u003e\n\u003cli\u003eLinear power supply with a large Amplimo toroidal transformer\u003c\/li\u003e\n\u003cli\u003e90,000 µF of power-supply capacitance\u003c\/li\u003e\n\u003cli\u003eBalanced XLR and unbalanced RCA inputs\u003c\/li\u003e\n\u003cli\u003eSelectable 18 dB or 26 dB gain\u003c\/li\u003e\n\u003cli\u003eSelectable automatic on\/standby operation\u003c\/li\u003e\n\u003cli\u003eExtensive thermal, DC, short-circuit, and clipping protection\u003c\/li\u003e\n\u003cli\u003eDesigned and made in the Netherlands\u003c\/li\u003e\n\u003cli\u003eFive-year limited warranty with registration\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003eAmplifier Type:\u003c\/b\u003e Monaural class-AB power amplifier\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eInputs:\u003c\/b\u003e 1 x balanced XLR; 1 x unbalanced RCA\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eInput Impedance (XLR):\u003c\/b\u003e 33 kΩ\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eInput Impedance (RCA):\u003c\/b\u003e 16 kΩ\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eGain:\u003c\/b\u003e 18 dB or 26 dB, selectable\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eOutput Power (8 Ohms):\u003c\/b\u003e \u0026gt;150 W\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eOutput Power (4 Ohms):\u003c\/b\u003e \u0026gt;200 W\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eOutput Impedance:\u003c\/b\u003e \u0026lt;10 mΩ\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDamping Factor (8 Ohms):\u003c\/b\u003e \u0026gt;800\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eFrequency Response:\u003c\/b\u003e 0.1 Hz–300 kHz\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eSignal-to-Noise Ratio (1 W, 8 Ohms):\u003c\/b\u003e 96 dB\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eSignal-to-Noise Ratio (150 W, 8 Ohms):\u003c\/b\u003e 118 dB\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eTHD (1 W, 8 Ohms):\u003c\/b\u003e \u0026lt;0.0001%\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eTHD+N (1 W, 8 Ohms):\u003c\/b\u003e -96 dB\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eSpeaker Connections:\u003c\/b\u003e Binding posts compatible with bare wire, spade connectors, and 4 mm banana plugs\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eOperating Power Consumption:\u003c\/b\u003e 65–600 W\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eStandby Power Consumption:\u003c\/b\u003e \u0026lt;5 W\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDimensions (W x D x H):\u003c\/b\u003e 9.8\" x 9.8\" x 9.4\" (250 x 250 x 240 mm)\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eWeight:\u003c\/b\u003e 33.1 lb. (15 kg)\u003c\/p\u003e\n","brand":"Grimm Audio","offers":[{"title":"Default Title","offer_id":53894052872376,"sku":"GA-PA1","price":26500.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/files\/PA1.jpg?v=1787085252","url":"https:\/\/upscaleaudio.com\/products\/grimm-audio-pa1-monoblock-power-amplifier-pair","provider":"Upscale Audio","version":"1.0","type":"link"}