Overview

The Bryston 4B Cubed is a legendary dual-channel stereo amplifier that serves as the cornerstone for high-performance audio systems worldwide. It addresses the need for high-current delivery and absolute transparency by providing 300 watts per channel into 8 ohms. Featuring Bryston's patented Cubed-series circuitry, it effectively eliminates noise and distortion to reveal the subtle nuances of any recording. Its robust, convection-cooled design ensures that it remains silent and stable during the most demanding musical passages, making it the definitive choice for audiophiles who demand power without sonic coloration.

Simcoe Audio Video Insight

The 4B is arguably the most famous amplifier in Bryston's history, and for good reason. In our showroom, we consider it the "gold standard" for a stereo power stage; it has the unique ability to make almost any speaker sound its absolute best. Whether you are driving a pair of sensitive monitors or demanding floorstanders, the 4B Cubed provides a sense of grip and control that brings out a level of detail in the bass and air in the highs that is hard to match. It is a true heirloom-quality component that stays in a system for decades.

Pro Tip: Best for users who want to simplify their setup while maximizing performance. While it is a stereo amplifier, it can be bridged into a monoblock configuration to deliver an incredible 900 watts into 8 ohms, allowing you to start with one 4B Cubed now and add a second later if you upgrade to even more power-hungry speakers.

More Details

Why It Wins

• High Output Power: Delivers a rock-solid 300W per channel into 8 ohms and 500W into 4 ohms, providing effortless headroom for dynamic musical peaks.
• Salomie Input Circuit: Employs a unique, patented input stage that significantly lowers the noise floor and improves linearity compared to traditional designs.
• Convection Cooled Reliability: Features massive external heat sinks that dissipate heat without the need for internal fans, ensuring a dead-silent listening environment.

What Makes It Different

The 4B Cubed stands out by balancing massive power with surgical precision. Unlike many high-output amplifiers that can sound "clinical" or "sterile," the 4B Cubed maintains a musical, neutral character that doesn't add its own flavor to the music. It is also one of the most reliable amplifiers ever made, featuring a sophisticated soft-start circuit that prevents household breakers from tripping and a comprehensive protection system that monitors the amp's health without ever touching the audio signal. This "set it and forget it" reliability is why it is found in both home listening rooms and professional recording studios alike.

Technical Highlights

• Harmonic Accuracy: Extremely low distortion figures (less than 0.005%) ensure that the amplifier does not mask the natural textures of the instruments or vocals.
• Flexible Connectivity: Equipped with both balanced (XLR) and single-ended (RCA) inputs, along with a switchable gain setting (23dB or 29dB) for perfect preamp matching.
• Independent Power Supplies: Each channel utilizes its own independent power supply circuitry to prevent crosstalk and ensure maximum separation.

Buyers Guide

Who This Is For

• The Serious Two-Channel Listener: Anyone building a dedicated stereo system who wants an amplifier that can handle any speaker they choose now or in the future.
• The Studio Professional: Ideal for recording and mastering engineers who require an amplifier that tells the truth about what is on the recording.

What To Pair It With

• Bryston BP-17 Cubed Preamplifier: Provides the most transparent signal path possible to ensure the 4B Cubed receives an uncolored signal.
• DALI SONIK 7 Slim Towers: The high-current grip of the 4B Cubed is perfect for controlling the dual 7-inch woofers and revealing the air of the hybrid tweeter module.

Alternative Options

If you require absolute separation and even more power, a pair of Bryston 7B Cubed monoblocks provides 600W per channel. For those building a multi-channel home theater system, the Bryston 9B Cubed offers a modular multi-channel solution. If you are looking for a high-quality integrated solution that combines a preamp and power amp in one chassis, the Bryston B135 Cubed is an excellent alternative for smaller systems.