Bryston 4B³ Cubed 2.0 Stereo Power Amplifier

The Bryston 4B³ Cubed 2.0 is the latest generation of one of the most enduring power amplifiers in high-end audio.

The original Bryston 4B arrived in 1978, and more than four decades later the 4B remains at the heart of the Bryston amplifier lineup. Now in its sixth generation, the 4B³ Cubed 2.0 delivers 300 watts per channel into 8 ohms and 500 watts per channel into 4 ohms, combining serious power with the neutrality, control and reliability that made the 4B a HiFi classic.

This is a true dual-mono power amplifier designed to drive everything from high-performance stand-mount speakers to large, demanding floorstanding loudspeakers.

True Dual-Mono Architecture

The 4B³ Cubed 2.0 is built as two independent amplifier channels, each with its own dedicated power supply and transformer.

That dual-mono architecture helps provide the current delivery, channel separation and control needed to properly drive demanding loudspeakers while maintaining clarity when the music becomes complex.

Power output is rated at:

• 300 watts per channel into 8Ω
• 500 watts per channel into 4Ω

That combination of power and current capability is a major reason the 4B has remained such a versatile amplifier for so many years.

Bryston Cubed Series Technology

The 4B³ incorporates Bryston's patented Salomie circuit, technology used throughout the Cubed Series amplifier lineup.

The design is focused on reducing noise and distortion while maintaining the speed, transparency and dynamic capability expected from a high-performance Bryston amplifier.

Total harmonic distortion plus noise is rated at less than 0.005% from 20Hz to 20kHz at rated power into 8 ohms.

Balanced XLR & RCA Inputs

The 4B³ Cubed 2.0 can integrate easily into a wide range of systems with both:

• Balanced XLR inputs
• Single-ended RCA inputs

Switchable 23dB or 29dB gain provides additional flexibility when matching the amplifier with different preamplifiers and system configurations.

A 12V DC trigger allows automated power control when integrated with compatible preamplifiers or control systems.

No Fans. No Noise.

Despite its substantial power output, the 4B³ is fully convection cooled.

There are no cooling fans adding mechanical noise to the listening room. The amplifier's substantial chassis and heatsink architecture dissipate heat passively.

Bryston also incorporates a microprocessor-controlled SoftStart sequence to manage startup current and reduce the chance of tripping a circuit breaker when the amplifier powers on.

Standby consumption is less than 500mW.

Built in Canada

Bryston amplifiers have earned their reputation not only for sound quality but also for exceptional build quality and longevity.

The 4B³ Cubed 2.0 is made in Canada and housed in a machined and anodized aluminum enclosure.

Bryston backs the amplifier with its legendary 10-year warranty, reinforcing the company's long-standing approach of building electronics intended to remain in a system for years rather than becoming disposable technology.

Key Specifications

• Type: Dual-Mono Stereo Power Amplifier
• Power Output at 8Ω: 300W × 2
• Power Output at 4Ω: 500W × 2
• Frequency Response: <1Hz–100kHz, -3dB
• THD+N: <0.005% from 20Hz–20kHz at rated power into 8Ω
• Inputs: Balanced XLR and single-ended RCA
• Gain: Switchable 23dB / 29dB
• RCA Noise: < -106dB
• XLR Noise: < -111dB
• Balanced Input Impedance: 30kΩ+ / 6kΩ-
• Unbalanced Input Impedance: 7.5kΩ
• Cooling: Passive convection — no fans
• 12V Trigger: Yes
• Standby Consumption: Less than 500mW
• Dimensions: 18" W × 6" H × 15" D
• Depth with Front Handles: 16.75"
• Weight: 52 lbs.
• Warranty: 10 years
• Made in Canada

Available Configurations

The 4B³ Cubed 2.0 is available in several front-panel configurations:

• Consumer faceplate without handles
• Consumer faceplate with handles
• PRO rackmount faceplate
• PRO rackmount faceplate without handles

This allows the same amplifier platform to work equally well in a dedicated two-channel listening room, custom-installed system or professional environment.

A Bryston Classic, Refined

There are plenty of powerful amplifiers on the market. What makes the 4B different is its history.

Bryston has been building and refining the 4B since 1978. Rather than continually replacing the model with something entirely different, each generation has evolved the same basic idea: build a powerful, neutral and exceptionally reliable amplifier capable of driving a huge range of loudspeakers.

The 4B³ Cubed 2.0 is the latest version of that philosophy.

Experience Bryston at The Grid HiFi

The Grid HiFi is your Bryston and high-end audio expert in Houston, Texas.

With 300 watts per channel into 8 ohms and 500 watts into 4 ohms, the 4B³ has the power to work with an enormous range of high-performance loudspeakers. The key is matching that power with the right preamplifier, source components and speakers.

The Grid can help build the complete system around the 4B³, including preamplifiers, DACs, streamers, turntables, loudspeakers, subwoofers, cabling and equipment support.

Whether you're building a dedicated two-channel system or looking for serious amplification for an existing pair of speakers, the Bryston 4B³ remains one of the industry's proven choices.

Contact The Grid HiFi for Bryston 4B³ Cubed 2.0 availability, demonstrations, system matching and professional setup.