2.5B Cubed Dual-Mono Amplifier

2_5B3 Macro-web

Though most recognize Bryston for big ultra-high powered amplifiers, few realize that we have big sound in small packages too. The 2.5B Cubed is no flea-watt model, yet at 135 watts per channel, it is our lowest output Cubed Series model. The benefit is a compact chassis and great price for a level of clarity and sound quality that usually costs far more. Featuring an identical power section as our B135 Cubed integrated amplifier, this stand alone dual-mono design sounds incredible in systems where massive power output is simply a waste.


  • Balanced XLR and Single ended RCA input
  • 2 Channels each with fully independent power supplies including transformers
  • 135W into 8 ohms (and up to 180 into 4 ohms) per channel
  • 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 aluminum 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


  • Silver or black faceplate
  • 17” or 19” faceplate (non-rack mountable)
  • PRO version includes 19" rack mount dress panel in black plus rear panel channel trim pots (-14 to 0dB)
DimensionsInches: 17 or 19 W x 8.1 H x 15 D
Weight28 lbs | 13 kg
Frequency Response:<1Hz - 100kHz: -3dB
THD+N (20Hz-20kHz @ Rated Power, 8Ω):<0.005%
Power Output (per channel):135W @ 8Ω | 180W @ 4Ω
Noise:RCA: -<109dB
XLR: <-114dB
Input Impedance:Unbalanced 7.5kΩ
Balanced 30kΩ+ / 6kΩ-

Steve Guttenberg

Cnet / The Audiophiliac

"He's an emotionally naked singer, so it's just you and him, and the 2.5B3 makes that perfectly clear. I felt a total connection to his sound, so my audio system melted away, and all that remained was Brosseau and his hollow-body electric guitar. The best components do that; they let the music come through, seemingly without adding or taking anything away."


"There are few amplifiers that offer a more even, composed, linear character than the 2.5B3. This amplifier is very enjoyable and entertaining to listen to for long periods. No particular trait draws the listener’s attention away from the overall performance due to some imbalance or distracting sonic flaw. The Bryston 2.5B3 Cubed is a fine amplifier that will survive many system upgrades."




Made In Canada


20 Year Warranty on Analog and Loudspeakers


High Performance

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