Bryston 21B3 Three-Channel Amplifier


*Please check with our online customer service team or your local store for stock availability


The Bryston 21B³ three channel amplifier was crafted to provide superb amplification for your Bryston Active Loudspeaker System. The Bryston 21B³ is essentially composed of a 7B³ and a 4B³ amplifier, which provides plenty of power for a single active loudspeaker. Two of these amplifiers will drive your active system with breathtaking ease and clarity.

  • Fully active loudspeaker systems dispense with passive crossovers found in conventional loudspeakers in favor of inserting the crossovers before the amplifier. The benefits include increased flexibility of filter shapes, the ability to make fine-grained adjustments resulting in improved on and off axis response (these are often competing objectives in passive loudspeakers), direct coupling of the amplifier to the driver (avoiding losses inherent in passive crossovers), and higher SLP with lower distortion. The Bryston Active Loudspeaker System combines decades of research into acoustics, electronics, amplification, and state of the art components to recreate your recordings with stunning realism.

    Inputs: 3x Balanced Inputs (XLR or TRS), 3x Single Ended Inputs (RCA)

    Power Capabilities:
    1x 600W into 8Ω
    2x 300W into 8Ω
    1x 900W into 4Ω
    2x 500W into 4Ω

  • Features:

    Designed to meet the power requirements of a single active loudspeaker
    Balanced and Single Ended audio inputs
    Selectable gain at 23 or 29dB
    No fans or other moving parts
    Regulated power supplies to all voltage gain stages
    Convection cooled and housed in a fully aluminum chassis
    Independent power supplies for each channel
    Energy storage power transformers maximize dynamic range

  • Specifications:
    Harmonic Distortion (1st Channel): ≤.005% from 20Hz to 20kHz at 600W
    Noise below full output (1st Channel): -113dB single ended, -116dB balanced
    Harmonic Distortion (2nd and 3rd Channel): ≤.005% from 20Hz to 20kHz at 300W
    Noise below full output (2nd and 3rd Channel): -110dB single ended, -113dB balanced
    Slew Rate: >60V/µS
    Power Bandwidth: <1Hz to >100kHz
    Damping Factor: >300 at 20Hz (8Ω)


    Available with silver or black faceplate
    17” (without handles) or 19” (with handles) faceplate available (non-rack mountable)

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