**Price in USD**
Influenced by some of our classic groundbreaking SP preamplifiers, the SP20 takes visual cues from past Audio Research products while incorporating our latest designs and technologies. The SP20 is a full-function line stage which incorporates a phono preamplifier and, for the first time ever on an Audio Research preamp, there is a ¼" headphone jack.
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FREQUENCY RESPONSE: Line: +/- 3dB 2 Hz to 80 kHz; -3dB 0.8Hz to 220 kHz, Phono: +/- 0.1dB of RIAA 10Hz to 20kHz; +/- 0.4dB 5Hz to 80kHz, Headphone: +/- 0.05dB 20Hz to 20kHz; -3dB 0.8Hz to 220kHz
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THD+N: Line: <.003% at 2V RMS, Bal output, Phono: <.005% at 3V RMS output, to Record output, Headphone: <.009% at 1V RMS output
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GAIN: Line: 13.8dB, Processor: 0dB, Phono: 58dB @ 1KHz to Record output, Headphone: 11.3dB
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NOISE: Line: <-101dBV volume at max, Phono: <-77dBV to Record output, Headphone: <-88dBV volume at max.
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CHANNEL SEPARATION: Line: > 105dB Balanced output, Phono: >76dB to Record output, Headphone: >62dB
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SIGNAL TO NOISE RATIO: Line: >125dB Balanced output, Phono: >94dB to Record output, Headphone: >110dB
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RATED OUTPUTS: Line: 2V RMS (1V RMS SE) into 200k ohms balanced load (maximum balanced output capability is 18V RMS at less than .5% THD+N at 1kHz.).
Phono: 0.5V RMS into 100k load at Record output (maximum output capability is 25V RMS). Headphone: 6V RMS maximum into 30 to 300 ohm load.
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INPUT IMPEDANCE: 120k ohms Balanced, 60k ohms SE; Phono impedance programmable (100, 200, 500, 1000 or 47k ohms w/200pf unbalanced).
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OUTPUT IMPEDANCE: 500 ohms Balanced, 250 ohms SE; 1000 ohms Record Out SE; <.05 ohms Headphone SE.
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OUTPUT POLARITY: Non-inverting.
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MAXIMUM INPUT LINE:m19V RMS Balanced, 9V RMS SE. Phono: 70mV RMS at 1kHz.
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CONTROLS: Rotary Volume (104 steps), Rotary Input selector. Push
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BUTTONS: Power, Mute, SPKR Off. Interactive Touch Screen. Rear RS-232 control and Remote IR input.
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POWER SUPPLIES: Electronically regulated low and high voltage supplies. Automatic 30 sec. warm-up/brown-out mute. Line regulation better than .01%.
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TUBE COMPLEMENT: 4 6H30 dual triode.
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POWER REQUIREMENTS: 100 - 135VAC 60Hz (200 - 270VAC 50/60Hz) 77 watts maximum. Standby 2.7 watts.
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DIMENSIONS: Width 19" (48 cm), Height 5.25"(13.4 cm), Depth 16.5"(42 cm)
