Bryston 21B³ Three-Channel Amplifier


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  • Bryston impressed the audiophile community with an ultimate fully active loudspeaker system that let you choose your own amplifiers. Listeners were free to build 6-channel systems any way they liked. Now Bryston introduces the 21B³-an amplifier dedicated to bringing Cubed Series excellence to an easy to manage package. Each 21B³ has 3 channels. One is rated at 600 watts, the other two are rated at 300 watts each. Active loudspeaker customers will use the high powered channel for the bass section and smaller channels for the midrange and high frequency sections of their 3 way systems. Since the 21B³ is based on our 7B³ and 4B³ amps, it can also be used to power any 3 channels such as the front LCR in a home theatre.

  • • Balanced XLR and Single ended RCA input
    • 3 Channels each with fully independent power supplies including transformers
    • 600W into 8 ohms (and up to 900 into 4 ohms) for one channel.
    • Two more channels each rated at 300W into 8 ohms and 500W into 4 ohms
    • The patented Salomie circuit found in all Cubed Series amplifiers
    • Switchable gain (23dB or 29dB)
    • Fully convection cooled means no noisy fans
    • Machined and anodized aluminium enclosure and dress panel
    • Less than 500mW standby power consumption
    • SoftStart microprocessor controlled startup sequence won't trip circuit breakers
    • DC trigger for automated turn on and turn off
    • Legendary Bryston 20 Year Warranty
  • Dimensions

    Inches: 17 or 19 W x 8.1 H x 16.8 or 18.4 (with front handles) D

    Weight 91 lbs | 41 kg
    Frequency Response <1Hz - 100kHz: -3dB
    THD+N (20Hz-20kHz @ Rated Power, 8Ω) <0.005%
    Power Output (per channel) CH 1: 600W @ 8Ω | 900W @ 4Ω
    CH 2&3: 300W @ 8Ω | 500W @ 4Ω
    Noise RCA: <-115dB
    XLR: <-116dB
    Input Impedance Unbalanced 30kΩ
    Balanced 5kΩ / leg