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Bryston 4B (2)

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Sonic Excellence, Reliability, and Value
The Bryston 2B-LP Amplifier


Bryston has a continuing commitment to design and manufacture the most accurate and reliable audio product available. They maintain an extensive research and development division which is constantly looking for methods to improve the performance, value and reliability of their amplifiers. The Bryston ST Series of amplifiers is the direct result of this continuing quest for perfection. These amplifiers represent a substantial step forward in the art and science of audio amplification.

The Bryston ST Series amplifiers incorporate the use of an innovative gain stage topology which yields a substantially lower noise floor through the use of low-impedance pathways within the amplifier. This same approach also has strong advantages in reducing the overall distortion performance. Brystonís computer controlled distortion analyzers confirm Inter-modulation Distortion levels less than 10 parts per million (below 0.0009%) are typical for this new circuitry. All ST amplifiers use Brystonís proprietary Quad-Complementary output section, which improves linearity to a new standard of accuracy, while virtually eliminating aggressive higher harmonic distortion products. From input to output, all the circuitry in the ST series of amps has been optimized for the most accurate performance possible. Custom dual torodial power supplies provide precise and focused soundstaging. The dual power supplies employ multiple filter capacitors per channel, rather than single pairs of larger filter cans. This allows improved high frequency response and reduces overall losses in the supply. Standard features included both balanced and unbalanced gold plated inputs, a ground lift switch to reduce those annoying ground loops and a stereo/mono switch for bridging the outputs if higher power levels are required.

The Bryston 4B is something of a legend among audio amplifiers. As our most popular amplifier over the years, it has attained inter-national status as an amplifier suitable for the finest and most sophisticated sound systems. Whatever the venue, be it a recording studio, a sound stage, a broadcast facility, a home theater installation, or a state-of-the-art stereo system, Bryston has continued to be the number one choice.

Although the description of circuit innovations can indicate the research and commitment we bring to the design and manufacturing of our audio products, only in the listening does the result of that dedication become clear. Brystonís ST Series amplifiers are capable of doing justice to the most refined audio/video system, with the subtlest details of the musical fabric revealed in their original form.

4B ST Specifications

Power Output:
250 watts per channel into 8 ohms
400 watts per channel into 4 ohms
800 watts, bridged into 8 ohms
Gain: 29dB (unbalanced)
23dB (balanced)
Distortion: < 0.007% from 20Hz to 20kHz at 120 watts, IM or THD
Noise: >106dB below rated output
Slew Rate: >60 volts per microsecond
Greater than 120 volts per microsecond, bridged
Power Bandwidth: <1 Hz to over 100 kHz
Damping Factor: Over 500 at 20 Hz, ref. 8 ohms
Input Sensitivity:
Balanced 2 Volts in = 100 watts at 8 ohms
3.0 Volts in = 250 watts into 8 ohms
5.6 Volts in = 800W into 8 ohms Bridged
Input Sensitivity:
Unbalanced 1 Volt in = 100 Watts at 8 ohms
1.5 Volts in = 250 watts into 8 ohms
2.8 Volts in = 800W into 8 Ohms Bridged
Input Impedance:
50 Kohms unbalanced
20 Kohms balanced

Features Over 6,400 cm/square of heatsinking Regulated power supplies to all voltage gain stages Gold plated input and output connectors Switchable balanced XLR-1/4 inch and RCA unbalanced inputs Remote power turn-on 4-12V, AC/DC

A/C Power:
    Consumption & Heat Load
  1. Idle Current 186W
  2. Stereo 8 Ohms (250W ea.) 1200W
  3. Stereo 4 Ohms (400W ea.) 1920W
  4. Bridged 8 Ohms (800W) 1944W
  5. Max. Wattage 1944W
  6. Max. Heat Dissipation 1144W / 3904 Btu/Hr
Dimensions 19 x 5.25 x 15.5 inches, wt: 42 lbs
48.25 x 13.33 x 39.4 cm, wt. 18kg
Click here to visit the Bryston website

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