Bryston 4B SST PRO

The 4B SST is a dual mono design 2 x 300W per channel audio power amplifier. Each channel selects a balanced or single ended input. Each channel selects a gain of 29dB(1v) or 23dB(2v). The 4B SST includes ‘soft start’ power control circuitry to eliminate high inrush currents when A/C power is applied. The power up or turn-on of the 4B SST may be activated by remote control voltage.

• Membrane Power Switch
• Soft start circuit on power up
• Multiple filter capacitance per channel
• Selectable inputs for balanced or single ended (RCA) connectors
• Polarity Switch (0 or 180 degrees) on each channel (6B & 9B only)
• Remote 12 Volt power trigger input with delayed output feature
• Selectable gain settings

• Power Output: 300 watts per channel into 8 ohms; 500 watts per channel into 4 ohms
• Gain Select and Sensitivity: 29dB - 1.8Vin = 300W @ 8 Ohms - (1V Position); 23dB - 3.6Vin = 300W @ 8 Ohms - (2V Position)
• Input Impedance: 50 Kohms single ended; 20 Kohms balanced
• Distortion IM or THD+noise: < 0.005% 20Hz to 20kHz at 300 watts into 8W; < 0.007% 20Hz to 20kHz at 500 watts into 4W
• Noise (Measured with input shorted): -20Hz to 20kHz.
>110dB below rated output 29dB gain (- 75dBu)
>113dB below rated output 23dB gain (- 78dBu)
• Slew Rate > 60 volts per microsecond
• Power Bandwidth < 1 Hz to over 100 kHz
• Damping Factor Over 500 at 20 Hz, ref. 8 ohms

Power Consumption & Heat Load
• At Idle: 170 Watts
• Max. Heat Dissipation: 580 Btu/Hr.

• 2 channels @ 300W @ 8 ohms: 1280 Watts
• Max. Heat Dissipation 8 ohms: 2320 Btu/Hr.
• 2 channels @ 500W @ 4 ohms: 2100 Watts
• Max. Heat Dissipation 4 ohms: 3750 Btu/Hr.

• Bridged @ 900W @ 8 ohms: 2040 Watts
• Max. Heat Dissipation 8 ohms: 3890 Btu/Hr.

Dimensions and Weight

L x H x D (19” version with handles)
48.3 x 13.3 x 43.8cm - 19” x 5.25” x 17.25“ (mounted rack depth - 40.1cm - 15.75")

Weight: approx. 22kg - 50 lbs