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Cubed Series 3B³ Dual-Mono Amplifier

Cubed Series 3B³ Dual-Mono Amplifier

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Way back in 1973, a young engineer named Chris Russell took his new prototype amplifier, the PRO 3, to an A list studio in Toronto for an audition. He left with an order for two. Nearly five decades later, that amp has evolved into the Bryston 3B Cubed. It's twice as powerful as the original and ten times as impressive. Though it's one of our smaller amplifiers, it features all the same technology found in our venerable 4B. One big advantage, however, is the shallow depth. The 3B Cubed is a great all around amp, but is especially useful for shallow mounting depth applications.


- Balanced XLR and Single ended RCA input

- 2 Channels each with fully independent power supplies including transformers

- 200W into 8 ohms (and up to 300 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) 19" comes with front mounted handles

- PRO version includes 19" rack mount dress panel in black plus rear panel channel trim pots (-14 to 0dB)

Bryston Cubed Series 3B Dual-Mono Amplifier User's Manual




17" or 19" ( W ) x 8.1" ( H ) x 10.75" or 12.75" ( D )


35 lbs 

Frequency Response:

<1hz - 100khz: -3db

THD+N (20Hz-20kHz @ Rated Power, 8Ω):


Power Output (per channel):

200W @ 8Ω | 300W @ 4Ω


RCA: -<106db


XLR: <-111db

Input Impedance:

Unbalanced 7.5kΩ


Balanced 30kΩ+ / 6kΩ-

Contact us to inquire how you can finance your purchase through our partner, Synchrony.