Bryston 4B ST

Solid State Stereo Power Amplifer

Stereophile Magaine says "this Bryston 4B-ST remains an audio classic".

4B-ST’s high-current delivery and damping factor makes it sound tight, clean and punchy with many speakers, adding nothing and taking nothing away. The amp is able to deliver controlled and resolved bass and near spot-on treble/midrange performance with excellent retrieval of details.

Delivers 250W continuous into 8 ohms (24dBW), 400Wpc rms continuous into 4 ohms (23dBW); 800W continuous into 8 ohms in bridged mode (29dBW).

This amp has seen some use, but still has many years of life left in it!   No original packing, but we are experts at safe packing here at Saturday Audio:)


  • Current delivery: 16A continuous, 48A peak, per channel
  • Frequency response: 1Hz–100kHz, ±3dB for 1W output
  • Total harmonic distortion: <0.007%, 20 Hz- 20 kHz @ 250 Wpc
  • S/N Ratio: hum and noise, 108dB below rated output, 90dB IHF
  • Input sensitivity: 1.4V for 250Wpc into 8 ohms
  • Voltage gain: 30dB
  • THD+noise: 20Hz–20kHz, 0.01%
  • IM distortion (60Hz+7kHz, 4:1, SMPTE method): less than 0.01% at rated power
  • Damping factor: greater than 500 at 20Hz, at 8 ohms (equivalent to an output impedance of less than 0.016 ohms)
  • Input impedance: 50k ohms unbalanced, 30k ohms balanced
  • Gold-plated connectors
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