Bryston 4B-SST 2

Only selling due to a significant upgrade.  You will not be disappointed by this one.  I’ve owned a lot of gear over the years and this is the best-built piece of them all.  Your grandkids will be enjoying it years from now!

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The 4BSST2 is a dual mono design audio power amplifier with two channels of each. Each channel has switch selectable balanced and single ended inputs. Each channel also has switch selectable gains of 29dB(1v) or 23dB(2v). The 4BSST2 includes SoftStart power control circuitry to eliminate high inrush currents when A/C power is applied. The power-up or turn-on of the 4BSST2 may be activated by the push-button power switch on the front panel or via hard wired remote control voltage.

SPECIFICATIONS:
Design: Two-Channel Solid State Power Amplifier
Power Output: 300 Watts RMS x 2 into 8 Ohms/500 Watts per channel into 4 Ohms
MFR: 1Hz – 100kHz
Inputs: RCA Unbalanced, XLR Balanced
Input Impedance: 50k Ohms Unbalanced, 20k Ohms Balanced
THD+N: 0.003%
Dimensions: 5.25″H x 17.25″W x 19″D
Shipping Weight: 63 Pounds

4BSST2 TECHNICAL SPECIFICATIONS from the owners manual:
Power Output: 300 watts per channel into 8 ohms, 500 watts per channel into 4 ohms
Gain: 29dB position = 28.28V/V 23dB position =14.14V/V
Sensitivity: High: 1.0Vin = 100W out with an 8Ω load1.8Vin = 300W out with an 8Ω load Low: 2.0Vin = 100W out with an 8Ω load 3.6Vin = 300W out with an 8Ω load
Input Impedance: Individual mode: Single ended ≈ 60K Ohms
Balanced ≈ 20K Ohms
Bridged mode: Single ended ≈ 15K Ohms
Balanced ≈ 10K Ohms
IMD or THD + noise: < 0.005% 20Hz to 20kHz at 300 watts into 8 W
< 0.007% 20Hz to 20kHz at 500 watts into 4 W
Noise: Measured with input shorted, 20 Hz to 20K Hz.
>110dB below rated output 29dB gain (- 75 dBu)
>113dB below rated output 23dB gain (- 78 dBu)
Slew Rate: > 60 volts per microsecond
Power Bandwidth: < 1 Hz to over 100 kHz
Damping Factor: Over 500 at 20 Hz, ref. 8 ohms
Footprint: 17” version: 17”L x 16“D x 6.3”H
Shipping Weight: approx. 28.6 Kg (63 lbs)
Power Consumption & Heat Load:
At Idle: 170 Watts
Max. Heat Dissipation: 580 BTU/Hr.
2 channels @ 300W into 8 ohms: 1280 Watts
Max. Heat Dissipation: 2320 BTU/Hr.
2 channels @ 500W into 4 ohms: 2100 Watts
Max. Heat Dissipation: 3750 BTU/Hr.
Bridged @ 900W @ 8 ohms: 2040 Watts Max.
Heat Dissipation: 3890 BTU/Hr.