audio research

Solid state four channel power amplifier.

From the ARC website

The SDA1 Four Channel Power Amplifier is designed for use with the SDP1 processor. Rated at 100 watts x 4 into 8 ohms (150 watts x 4 into 4 ohms), the SDA1 offers complete flexibility for installation in a wide range of multichannel music systems. It can be used on its own, in a four-channel system not requiring a center channel. Alternatively, either of the two channel pairs can be bridged to produce 300 watts into 8 ohms-yielding a perfect three-channel amplifier with higher power delivery to a center channel or passive subwoofer. Or, both pairs can be bridged simultaneously for a 300-watt per channel stereo amplifier. Inputs are balanced and single-ended.





MSRP (US new retail)


Power output 100 watts per channel into 8 ohms, 150 watts per channel into 4 ohms. 300 watts into 8 ohms, bridged
Power bandwidth (-3dB points) DC to 150 kHz into 8 ohms
Frequency response  
Input sensitivity 1.5V RMS for rated output (25.5 dB Gain) unbalanced or balanced
Input impedance 150K ohms unbalanced, 300K ohms balanced differential
Output taps  
Output regulation 0.09dB 8 ohm load to open circuit
Overall negative feedback 21 dB
Damping factor 100
Slew rate 50 volts/microsecond
Rise time 1.7 microseconds
Hum & noise Less than 40 microvolts RMS (117dB below rated output IHF A-weighted)
Power supply energy storage 154,000 uF total
Power requirements 105-125VAC 60Hz (210-250VAC 50Hz) 640 watts at rated output (100WPC 8 ohms), 800 watts at 150WPC 4 ohms, 800 watts maximum, 105 watts idle
Other Input polarity: Non-inverting at unbalanced inputs. Balanced pin 2+ (IEC-268)
Dimensions 19" (48 cm) W (standard rack panel) x 51/4" (13.3 cm) H x 127/8" (32.7 cm) D. Handles extend 11/2" (3.8 cm) forward of the 3/8" thick front panel. Output connectors extend 1" behind rear panel
Weight 37.2 lbs. (16.9 kg) Net; 48.7 lbs. (22.1 kg) Shipping.