Bryston 7B-ST Monoblock Power Amplifiers (pair) This listing is marked as sold.

Solid State / Tubed Solid State
Number of Channels 1/Mono
Power 600 Watts @ 8 Ω(1)
900 Watts @ 4 Ω(1)
Power Bandwidth < 1 Hz to over 100 kHz(1)
Slew Rate > 60 Volts per microsecond(1)
Total Harmonic Distortion < 0.005 %, 20 Hz – 20 kHz @ 600 Watts into 8 Ω(1)
< 0.007 %, 20 Hz – 20 kHz @ 900 Watts into 4 Ω(1)
Intermodulation Distortion < 0.005 %, 20 Hz – 20 kHz @ 600 Watts into 8 Ω(1)
< 0.007 %, 20 Hz – 20 kHz @ 900 Watts into 4 Ω(1)
Noise > 110 dB below full output 29 dB gain(1)
> 113 dB below full output 23 dB gain(1)
Sensitivity 2.3 Volts = 600 Watts @ 8 Ω (1 Volt position)(1)
4.6 Volts = 600 Watts @ 8 Ω (2 Volts position)(1)
Input Impedance 50k Ω unbalanced(1)
20k Ω balanced(1)
Damping Factor > 300 @ 20 Hz, ref. 8 Ω
Power Consumption and Heat Load At idle: 215 Watts(1)
600 Watts @ 8 Ω: 1284 Watts(1)
900 Watts @ 4 Ω: 1980 Watts(1)
Dimensions (W x D x H) 19 x 12.5 x 5.25(1)
48.3 x 32 x 13.3 cm(1)
Weight 50 lbs.(1)
22 kg.(1)

The manner in which THD+noise changed with output power for the 7B (at 1kHz) is shown in fig.7. The actual discrete clipping-point measurements (clipping defined as the 1% distortion) were 613W into 8 ohms (27.9dBW), 954W into 4 ohms (26.8dBW), and 595W into 2 ohms (21.7dBW). (The line voltage for these measurements varied between 118V and 119V; the readings for 4 and 8 ohm loads were taken in the series configuration and the 2 ohm load in the parallel connection).