User's Manual
3B SST and 4B SST Series Amplifiers
13
3BSST Technical Specifications 4BSST
Power Output
150 watts per channel into 8 ohms 
250 watts per channel into 4 ohms 
Gain Select and Sensitivity
29dB - 1.3Vin = 150W @ 8 Ohms - (1V Position)
23dB - 2.6Vin = 150W @ 8 Ohms - (2V Position)
Input Impedance
50 Kohms single ended
20 Kohms balanced 
Distortion IM or THD+noise
< 0.005% 20Hz to 20kHz at 150 watts into 8 W
< 0.007% 20Hz to 20kHz at 250 watts into 4 W
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 
Dimensions
19” version with handles - L x H x D
48.3 x 13.3 x 32cm - 19” x 5.25” x 12.5“ 
mounted rack depth - 28cm - 11.0" 
17” version
43.2 x 13.3 x 28cm - 17” x 5.25” x 11“
Weight: approx. 18kg - 40 lbs 
Power Consumption & Heat Load 
At Idle -  127 Watts
Max. Heat Dissipation - 433 Btu/Hr.
2 channels @ 150W @ 8 ohms - 668 Watts 
Max. Heat Dissipation 8 ohms -  1255 Btu/Hr.
2 channels @ 250W @ 4 ohms - 1096 Watts 
Max. Heat Dissipation 4 ohms - 2033 Btu/Hr. 
Bridged @ 450W @ 8 ohms -  1053 Watts
Max. Heat Dissipation 8 ohms - 2057 Btu/Hr.
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 8 W
< 0.007% 20Hz to 20kHz at 500 watts into 4 W
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 
Dimensions 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" 
17” version
43.2 x 13.3 x 40.1cm - 17” x 5.25” x 15.75“
Weight: approx. 22kg - 50 lbs 
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.










