21B³ Amplifier

The Bryston 21B³ three channel amplifier was crafted to provide suburb 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 breath-taking 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 loudspeaker 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.

Power Capabilities:
  • 600W into 8Ω (1st Channel)
  • 900W into 4Ω (1st Channel)
  • 300W into 8Ω (2nd and 3rd Channel)
  • 500W into 4Ω (2nd and 3rd Channel)

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: .5Hz to >100kHz
  • Damping Factor: >300 at 20Hz (8Ω)
Options:
  • Available with silver or black faceplate
  • 17” (without handles) or 19” (with handles) faceplate available (non-rack mountable)


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