Bryston 3B Cubed Amplifier

In Stock

The Bryston 3B3 is dual-channel (stereo) amplifier designed for a wide range of medium to high power audio/video systems. It serves up medium to high amounts of power without sacrificing sonic accuracy and long-term reliability.


  • Active extremely low distortion input buffer
  • Balanced and Single Ended audio inputs
  • Selectable gain at 23 or 29dB
  • Regulated power supplies to all voltage gain stages
  • Independent power supplies for each channel
  • Convection cooled and housed in a fully aluminum chassis
  • No fans or other moving parts
  • Bridging switch configures amplifier into a single 400W Channel
  • Harmonic Distortion: ≥.005% from 20Hz to 20kHz at 200W
  • Noise below full output: -110dB single ended, -113dB balanced
  • Slew Rate: >60V/μS
  • Power Bandwidth: .5Hz to >100kHz
  • Damping Factor: >500 at 20Hz (8Ω)
  • Switchable Gain: 23dB or 29dB


Fair Audio Favorite Award 2019

Press and Reviews

Bryston Magazine Guide
Bryston Magazine

Guides & Advice
by Moon Audio

Fair Audio Review

by Jochen Reinecke
Oct. 2019


General Features

17" (or 19" with handles) x 11.5" x 6.5"
Power Capabilities
200W into 8Ω
300W into 4Ω
400W into 8Ω (Bridged Mono)


  • Available with silver or black faceplate (3U + .55")
  • 17" (without handles) or 19" (with handles) faceplate available (non-rack mountable)
  • Rack mountable Pro Edition available in black (see Cubed Pro for more details)