2.5B SST3

Amplifiers, Power Amplifiers

0% Finance Available

This product has a 20 year warranty.

Finance Example

£790 initial 20% deposit then

£131.67 per month for 24 months

Other finance terms available

The Bryston 2.5B3³ is a compact, high quality, dual-channel (stereo) amplifier intended for use in home sound systems requiring a musically accurate, extremely reliable, no compromise power source.

Power Capabilities:

  • 135W into 8Ω
  • 180W into 4Ω
  • 360W into 8Ω (Bridged Mono)


  • Active extremely low distortion input buffer
  • Balanced and unbalanced 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 360W Channel


  • Harmonic Distortion: < .005% from 20Hz – 20kHz at 135W
  • Noise: 115dB below full output
  • Slew Rate: < 60V/µS
  • Power Bandwidth: .5Hz – > 100kHz
  • Damping Factor: > 500 at 20Hz (8Ω)
  • Gain: Switchable – 23dB or 29dB


  • Available with silver or black faceplate (2U + .55”)
  • 17” or 19” faceplate available (non-rack mountable)
  • Rack mountable Pro Edition available in black
Technical Specifications
Power capabilities 135W into 8Ω (180W into 4Ω)
360W into 8Ω (Bridged Mono)
Harmonic distortion < .005% from 20Hz – 20kHz at 135W
IM distortion < .005% from 10mW – 135W
Noise 108dB below full output
Slewing rate < 60V/µS
Power bandwidth .5Hz – > 100kHz
Damping factor > 500 at 20Hz (8Ω)
Sensitivity & Impedance 1V in = 100W 50k