Bryston 9B-ST THX 5 channel power amplifier. This amp has been tested and cleaned by a shop tech and is in excellent working and cosmetic condition. As seen in the photos, the cosmetic condition is very good. 

Bryston is famous for their power amplifiers and the 9B-ST THX is one of their most sought after amps for home theater. It is 120 watts into 8 ohms and 200 watts into 4 ohms. Strong, measured power, the 9B-ST can handle the heaviest loads while maintaining sonic hi fidelity quality. Thus, the 9B-ST THX is perfect for you home theater needs, while also being a good amp to use for listening to music recordings. The original retail for this amp was $6,495. 

Specs

 Output power into 8 ohms: 120Wpc (21dBW), 20Hz-20kHz, <0.5% THD (FTC). 
Output power into 4 ohms: 200W minimum continuous (23dBW). 
Frequency response: not rated. 
THD+noise: 0.007%, 20Hz-20kHz, ±0.1dB. 
Intermodulation distortion: 0.002%, 60Hz+7kHz mixed 4:1. 
Noise: -107dB, input shorted, dB below rated output, 20Hz-20kHz bandpass. Input impedance: 15k ohms, balanced or single-ended. 
Input sensitivity: balanced input regular, 2V in for 100W into 8 ohms; balanced input in +6dB switch position, 1V in for 100W into 8 ohms, unbalanced input, 1V in for 100W into 8 ohms.
Output impedance: not given. Damping factor: not given. 
Power consumption: typically 100VA, all channels idle; 900VA, all channels at full power into 8 ohms; 1600VA, all channels at full power into 4 ohms.

Dimensions: 17" (425mm) W by 5.25" (131.25mm) H by 17" (425mm) D. 
Weight: 75 lbs (33.8kg).