audio research

Solid state stereo line stage.

From the ARC website

The LS9 is an all-new, all-solid-state line level preamplifier which replaces the LS3/3B series. Using a low-voltage, pure Class A gain circuit with direct-coupled output (no coupling caps are used in the signal path), the LS9 yields 12dB of overall gain (factory adjustable to 18dB gain if necessary). Output capability is a substantial 24V RMS from the balanced main outputs. The LS9 also features complete IR remote control of all front panel functions, including a 70-step electronic relay volume attenuator and input selection. The LS9 offers two pairs of dedicated balanced inputs, three pairs of dedicated single-ended inputs; and a full tape monitor loop (single-ended in and out) is also provided.

The LS9 is designed to be left on continuously, drawing only 20 watts maximum continuous power. Housed in full-width 3.5" high chassis, the LS9 is a model of slim elegance that will fit neatly into almost any conceivable cabinet or shelving system. Since it generates very little heat internally, it may safely be left behind closed doors when not in use.




Platinum Grey faceplate.

MSRP (US new retail)


Frequency response 0.2Hz - 30kHz, ±0.5dB, -3dB below 0.1Hz and above 60kHz
Distortion (THD) <0.005% at 2V RMS, balanced output
Noise & hum 20µV RMS residual IHF weighted noise output, balanced with volume control set one step up from minimum
Gain 12dB (main balanced outputs); 6dB single-ended outputs (optional 18dB available); 0dB (tape out)
Input impedance 100kOhms (balanced); 50kOhms (single-ended)
Output impedance 500 ohms (balanced); 250 ohms (single-ended); 10kOhms minimum load, 1000pF capacitance
Output polarity  
Maximum inputs 14V RMS maximum, balanced; 7V RMS maximum, SE
Rated outputs 2V RMS into 100kOhms (balanced); 1V RMS into 50kOhms (single-ended). Maximum output capacity: 24V RMS at <1% THD at 1kHz
Power supplies  
Power requirements  
Dimensions 19" W x 3.5" H x 11" D
Weight 11 lbs.


Vol. 21 No. 1