Audio Research DS225 stereo power amplifier


Technical specifications

POWER OUTPUT 225 watts per channel into 8 ohms, 1% THD; 360 watts per channel into 4 ohms, both channels driven.

FREQUENCY RESPONSE (-3dB points at 1 watt) 5Hz to 55 kHz.

 INPUT SENSITIVITY 2.15V RMS for rated output (26.0dB Gain) single-ended or balanced.

 INPUT IMPEDANCE 150K ohms single-ended, 300K ohms balanced differential. 

OUPUT POLARITY Non-inverting from single-ended inputs. Balanced pin 2+ (IEC-268). 

OUTPUT REGULATION 0.06dB 8 ohm load to open circuit (Damping factor 167). 

OUTPUT CURRENT 15 amps peak at protective shutdown. 
 SLEW RAT 5 volts/microsecond. (20% maximum duty cycle). 

RISE TIME 5.0 microseconds. 

HUM & NOISE 300 microvolts RMS (103dB below rated output IHF A-weighted). 


POWER REQUIREMENTS 100-125VAC 60Hz (200-250VAC 50Hz) 488 watts at rated output (225WPC 8 ohms), 758 watts at 360WPC 4 ohms, 35 watts idle, Standby 1 watt. 

DIMENSIONS 19" (48 cm) W (standard rack panel) x 5 1⁄4” (13.3 cm) H x 14 1⁄4” (36.2 cm) D (front panel back). Optional handles extend 1 1⁄2” (3.8 cm) forward of the 1⁄4” thick front panel. Output connectors extend 0.9" behind rear panel. 

WEIGHT 34.9 lbs. (15.8 kg) Net; 41 lbs. (18.6 kg) Shipping.