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Information

The Bryston 4BSSTē PRO is a dual channel (stereo) amplifier which is acclaimed internationally as being suited for the finest and most sophisticated sound systems.

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.

Features

  • Balanced and unbalanced inputs
  • Variable attenuator (potentiometer) and gain select switch (23dB or 29dB)
  • No fans or other moving parts
  • Convection cooled and housed in a fully aluminum chassis
  • Bridging switch configures amplifier into a single 900W channel
  • 19" black rack mountable faceplate (3U)
  • Specifications

    Power Capabilities:
    300W into 8 Ohms (500W into 4 Ohms)
    900W into 8 Ohms (Bridged Mono)

    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 8 load, 1.8Vin = 300W out with an 8 load Low: 2.0Vin = 100W out with an 8 load, 3.6Vin = 300W out with an 8 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:
    19" version with handles: 48.3cmL x 40.6cmD x 16cmH 19"L x 17.5"D x 6.3"H
    17" version: 43.2cmL x 37.6cmD x 16cmH 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.
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