Bryston 4B Cubed PRO
Best professional power amplifier for high-end studio monitoring and critical listening.
The Bryston 4B Cubed PRO is a dual-mono design audio power amplifier featuring two channels, each capable of delivering 300 watts. It is engineered for high-performance professional audio systems. Its robust and aesthetically pleasing machined aluminum enclosure houses proprietary circuit designs, ensuring exceptional performance in both listening environments and laboratory tests. This amplifier offers individual channel trim pots, a 19-inch rack-mountable black faceplate (3U), an active low-distortion input buffer, and both balanced and single-ended audio inputs. It provides selectable gain at 23 or 29dB and features regulated power supplies for all voltage gain stages, with independent power supplies for each channel. The unit is convection-cooled and operates without fans or other moving parts.
$7695.00
Owner Satisfaction
4.7
/ 5
Category Rank
421
/ 1684
#421 in Power Amplifiers
Price vs Category Average
-7%
Below average
Channels
2
Who it's for
- Studio engineers requiring absolute sonic transparency and accuracy
- Professionals seeking long-term reliability and investment protection
- Audiophiles driving power-hungry speakers with demanding dynamics
Who should skip it
- Budget-conscious buyers looking for entry-level amplification
- Users with limited rack space or weight restrictions
- Listeners preferring a warmer, more colored sonic signature
Performance breakdown
Channel Separation
Dual-mono architecture ensures virtually zero crosstalk between audio channels.
Power Headroom
Effortlessly drives demanding speakers with massive, clean power reserves.
Signal Integrity
Active low-distortion buffering preserves the purity of the original source.
Build Quality
Machined aluminum chassis offers professional-grade durability and heat dissipation.
Operational Silence
Fanless convection cooling eliminates mechanical noise from the listening environment.
Installation Flexibility
Rack-mountable design and selectable gain suit diverse professional studio setups.
Key Specs
Channels
2
Power Output
300W per channel
Input
Balanced and Single Ended
Gain
Selectable 23dB or 29dB
Cooling
Convection cooled
Chassis
Fully aluminum
Faceplate
19" rack mountable (3U), black finish
Bridging
Configures into a single 900W channel
Features
- Dual mono design for superior channel separation
- Individual channel trim pots for precise adjustment
- Rack-mountable design for professional installations
- Active low-distortion input buffer for signal integrity
- Fanless convection cooling for silent operation
- Independent power supplies for each channel
- Bridging capability for increased power output
What customers say
Customers consistently praise the Bryston 4B Cubed PRO for its exceptional audio quality and unwavering reliability. Enthusiasts frequently highlight its ability to deliver a powerful, clean, and transparent soundstage, revealing intricate details in music. Many consider it a benchmark for professional and audiophile amplification, appreciating its robust build and consistent performance over many years. The amplifier's design is often noted for its understated elegance, complementing its superior sonic output. This combination of pristine sound and long term dependability forms the core of its strong appeal.
Know before you buy
The dual-mono design means each channel has its own independent power supply and circuitry. This prevents crosstalk between channels, resulting in a cleaner, more precise stereo image and better overall signal separation.
While it is built to professional standards, it is excellent for high-end home audio systems. Its fanless convection cooling ensures completely silent operation, making it ideal for quiet listening rooms.
The selectable gain allows you to match the amplifier to your specific preamplifier and speakers. Use the 23dB setting if you have a high-output preamp or sensitive speakers, and the 29dB setting if you need more headroom or are using a lower-output source.
Yes, the amplifier can be bridged into a single channel, which increases the power output to 900 watts. This is a useful configuration if you are driving particularly demanding speakers that require significant current.
Yes, the 4B Cubed PRO includes a 19-inch, 3U rack-mountable black faceplate. It is designed to integrate seamlessly into professional equipment racks while maintaining a clean, aesthetic look.
The trim pots allow you to precisely calibrate the gain of each channel independently. This is particularly useful for balancing the output levels in professional monitoring environments or compensating for slight variations in speaker sensitivity.
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