audio research
LS3

Description
Solid state stereo line stage. Exists in two versions: LS3 and LS3B (Balanced).

Introduced
1992

Discontinued
1996

Revisions
-

Options
Remote control (1994?)

MSRP (US new retail)
$1,495 (LS3)
$1,995 (LS3B)

Specifications

Frequency response ±.5 dB, 2.0 Hz to 100 kHz. -3dB points below 1 Hz and above 200 kHz
Distortion (THD) Less than .01% at 2V RMS output. (Typically less than .005% in midband)
Noise & hum 18 µV RMS maximum IHF weighted noise at main output with gain control minimum (more than 100 dB below 2V RMS output, or 4V balanced output (LS3B))
Gain Main output: 18 dB (optional 10 dB gain reduction)
Tape output: 0 dB
  Balanced output (LS3B): 24 dB
Input impedance 50 kOhms (100 kOhms Direct)
Output impedance 250 Ohms main output. 500 Ohms balanced (LS3B). Recommended load 60 kOhms and 100 pF (20 kOhms minimum and 1000 pF maximum)
Output polarity  
Maximum inputs 20V maximum
Rated outputs 2V RMS 2 Hz to 100 kHz, all outputs, 60 kOhm load (maximum output 35V RMS, 70V RMS balanced (LS3B) at 1/2% THD at 1 kHz into 100 kOhms)
Power supplies Electronically-regulated low and high voltage supplies. Line regulation better than .01%.
Power requirements 100-135VAC 60 Hz (200-270VAC 50/60 Hz) 25 Watts maximum (35 Watts maximum LS3B)
Other  
Dimensions 19" (48 cm) W x 5 1/4" (13.4 cm) H (standard rack panel) x 10 1/4" (26 cm) D. Handles extend 1 2/3" (4.1 cm) forward of front panel. Rear chassis fittings extend 1/2" (1.3 cm)
Weight LS3: 11 lbs. (5.0 kg) Net; 19 lbs.(8.6 kg) Shipping.
LS3B: 12 lbs. (5.5 kg) Net; 20 lbs.(9.0 kg) Shipping.

Reviews

Vol. 16 No. 8

Pictures

LS3:

LS3B: