2.5B Cubed Amplifier

MPN: 2.5B3

In Stock

The Bryston 2.5B³ dual-channel (stereo) amplifier is compact, high quality, and intended for us… More details

  • Questions?Questions?
  • Authorized Dealer - Trusted Since 2003Authorized Dealer
  • Roon Tested30 Day Returns
  • Free ShippingFree Shipping
  • US Sales OnlyShips in the USA

Power Up with a Free Cable

Get a free 4-foot Blue Dragon Cable with the purchase of any qualifying Amp or Power Conditioner.

Cable automatically added to cart with eligible items. Limited time only. Restrictions apply.

Blue Dragon Power Cable

For some, it's a gateway drug. The 2.5B³ is the least expensive way to get a Cubed Series amplifier, but it's far from cheap. Made with the same materials and loving care in our Peterborough, Ontario factory as every other product we make, the 2.5B³ will still surprise you with it's startling dynamics, crystal clarity and 3D enveloping spaciousness. You've really got to hear one to appreciate what an incredible deal this model is.

The Bryston 2.5B³ dual-channel (stereo) amplifier is compact, high quality, and intended for use in home sound systems requiring a musically accurate, extremely reliable, no compromise power source. The 2.5B3 is a dual-mono design audio power amplifier with two channels capable of 135 watts each intended for use in very high performance professional audio systems. Robust yet beautiful machined aluminum enclosures house our proprietary industry-leading circuit designs resulting in exemplary performance observed both in the listening space and in the laboratory.

C-Series variants are available in your choice of 17 inch or 19 inch wide non-rack mountable aluminum dress panels anodized in clear (silver toned) or black. PRO amplifiers feature 19 inch wide rack mountable dress panels in a black anodized front finish and also include individual channel trims located on the rear panel.

Press and Reviews

Bryston Magazine Guide
Bryston Magazine

Guides & Advice
by Moon Audio

"Soft or loud, big or small, the Bryston amplifier unfailingly delivers the full power range of a musical performance."

10 Audio

"More powerful than I expected from a 135 watt per channel amp. The more I played it, the more I liked the sound."

Steve Guttenberg, CNET


DimensionsInches: 17 or 19 W x 4.5 H x 14.75 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: -<106db
XLR: <-111db
Input Impedance:Unbalanced 30kΩ
Balanced 30kΩ+ / 6kΩ-