Bryston 4B-SST2 Amplifier - Barely Used and Complete
The original owner of this amplifier stated this specific example was purchased for a project but ultimately never used. It looks brand new to us and comes with all of the original packaging, manual, power cable, etc.
Best of all it includes the remaining period of its factory 20-year warranty!
This unit is equally suitable for your home or a studio, and should be able to power the most demanding speakers.
Retail was over 4k so here's your chance at a great bargain. Not sure of the exact age, but figure that at least 10 years remain for the warranty.
Click here for a PDF copy of the Bryston 4B-SST2 Owner's Manual
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.
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
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.
Our Testing Process for Amplifiers (Solid State) at SkyFi:
We start with a visual inspection of all internal components to make sure there are no signs of stress or aging. Capacitors are checked for telltale sings of bulging or leaking, resistors are checked for signs of overheating or cracking, and transistors are checked for signs of stress or damage.
We then power up the unit carefully and run a simple 1k sine wave while monitoring the output on an oscilloscope for signs of distortion or noise. Finally, we run the amplifier to its full rated power into the appropriate resistive load provided by our Sencore amplifier tester. If there is an issue, it will usually be noticeable at this point. If everything reads clean, we will often test for THD (Total Harmonic Distortion) measured by our Keithley distortion meter, and compare it against the original manufacturers specifications. The amplifier then remains powered on to "burn in" on our test bench for a few hours to make sure there are no heat related issues. If there are balanced inputs available they will be also be tested.
Final testing involves pushing actual music thorough the amplifier. We've learned over time that some issues are only noticeable to a trained ear while listening to familiar source material. Our test bench has reference vintage Kef speakers that we're very familiar with which quickly reveal any discrepancies. Some amplifiers will then move into our listening room where they are tested with our in-house reference speakers of choice.
Please click here for detailed specifics regarding our specialized packing process that separates us from the rest.
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