Cubed Series 4B³ Dual-Mono Amplifier

Cubed Series 4B³ Dual-Mono Amplifier

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A rarified few components in audiophile lore have become so ubiquitous that nearly every music lover once had, lusted after, or if they're really lucky, currently owns one. One such legend is the Bryston 4B. This product has been manufactured continuously ( though often refined ) since 1978. Currently this venerated amplifier is on its 6th. generation, and it's never been better. Now rated at 300 watts per channel into 8 ohms, ( & upwards of 500 watts into 4 ohms ), this true dual-mono amplifier is powerful enough for practically any speaker, yet it's priced to remain within reach. The degree of clarity, power, nuance, and outright truthfulness of this amp is stunning. If you've always wanted one, maybe now is just the right time.


- Balanced XLR & Single ended RCA input

- 2 Channels each with fully independent power supplies including transformers

- 300 watt into 8 ohms ( & up to 500 watt into 4 ohms ) per channel

- The patented Salomie circuit found in all Cubed Series amplifiers

- Switchable Gain ( 23 dB or 29 dB )

- 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 0 dB )

Bryston Cubed Series 4B Dual-Mono Amplifier User's Manual




17" or 19" ( W ) x 6.3" ( H ) x 15.5" or 17.75" ( D )


42 lbs 

Frequency Response

<1hz - 100khz: -3db

THD+N ( 20Hz-20kHz @ 8Ω )


Power Output per Channel

300 watt @ 8Ω | 500 watt @ 4Ω


RCA: -112 dB


XLR: -117 dB

Input Impedance

Unbalanced 7.5kΩ


Balanced 30kΩ+ / 6kΩ-

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