Bryston 4B Cubed Stereo Power Amplifier

Description

MY TAKE:

Bryston of Canada offers a range of outstanding products that offer not only outstanding sound quality, but exceptional reliability and customer support. In business for over fifty years, you know they’re doing something right. Highly recommended! – Galen Carol
 

Bryston has a major commitment to produce the most accurate and reliable product available. Every product undergoes a rigorous 100 hour test and burn-in procedure before shipment. Bryston is known for one of the strongest warranties in the industry, a full 20 Year transferable warranty, parts and labor, on all analog products. Digital products carry a full 5 Year transferable warranty. Note: products must be purchased from an authorized Bryston dealer to validate the warranty.

The Bryston 4B³ is a dual channel (stereo) amplifier which is acclaimed internationally as being suited for the finest and most sophisticated sound systems. It is currently our most popular Cubed Series model.

REVIEWS:

Future Audiophile: "It didn’t take me long in my listening to understand why the Bryston 4B Cubed has been in production and the object of desire to so many audiophiles for decades upon decades. With plenty power to spare, an accurate/controlled sound and an unmatched warranty in the audiophile world, I would think that most people who could justify an audiophile amplifier in this price range owe it to themselves to at least do an audition, if they can make that work. It is rare that you can swap out an audiophile component and hear such an immediate difference, but that was my experience with the Bryston 4B Cubed. The other thing that simply cannot be lost when thinking about this amplifier is the value. It was hard to miss when studying the audiophile comparables. You can find other amps in the Bryston 4B Cubed’s price range, that is easy enough, you can find some perhaps with similar (or more) power, but what you cannot find is another company that will give you the long-term support, value and that studio (lack of) sound.

"Sonically, expect to get massive reserves of power, tons of headroom and, most importantly, no color or flavor added to your recordings. That is hard to achieve in the under-$10,000 audiophile amplifier category, but Bryston has had this nailed for nearly as long as I have been alive.

"The Bryston 4B Cubed is a modern-day audiophile classic that is as relevant today as at any point in its evolution over what is going on 50 years."

Best Audiophile Power Amp, (Cost No Object) of 2025

Audiophile Style: (Three-way amplifier comparison). "Thus far, the refrain that differences between well-designed amplifiers tend to be small rang true. But adding the Bryston 4B Cubed to the mix upended my perception of what can be expected from an amplifier.

"The differences between the Bryston and the other amps seemed so significant that I had to run through my level matching a few more times to make sure I hadn’t made a mistake. The 4B Cubed provided it all: depth, detail, authority, accuracy, and smoothness. With no exaggeration." - JasonM
Full Review

Postive Feedback: "The sonic advances achieved with the new input stage have resulted in a singularity of sorts. This damn thing has perhaps the sweetest, purest top end I have ever encountered in a solid state amp at anywhere near the price (and way beyond), and a tonal finesse that rivals a fine modern tube amp, especially from the mid-bass and into the lower treble. Coupled with the amp's iron-fisted bass range and superbly low noise floor—a combination which allows micro and macro dynamic nuances to shine unimpeded—and you have one helluva performer.  

Those of you who haven't heard a Bryston power amp in say, the last five or six years, really owe it to yourself (and to the late Dr. Ioan Alexandru Salomie) to hear what this new generation of sonic stalwarts has to offer. I think you'll be pleasantly surprised by what you hear. Even if you decide at the end of the day that the Bryston sound isn't your cup of tea, I think you'd be hard-pressed to claim with any honesty that this isn't a damn fine sounding power amplifier.

Very, very highly recommended!!!" - Maurice Jeffries

SoundStage!: "If I were in the market for a new amp, I’d buy the Bryston 4B3 without hesitation. It is without a doubt a true classic, continuing in the tradition of the legendary Bryston B amps that came before it. With virtually faultless sound and the ability to drive just about any speaker with ease, the 4B3 may well be the best value today in a high-end, high-powered, solid-state amplifier. To better its combination of power output and finesse, you’ll likely have to pay much more." - Roger Kanno

FEATURES:

• Active extremely low distortion input buffer
• Balanced and Single Ended audio inputs
• Selectable gain at 23 or 29dB
• Regulated power supplies to all voltage gain stages
• Independent power supplies for each channel
• Convection cooled and housed in a fully aluminum chassis
• No fans or other moving parts
• Bridging switch configures amplifier into a single 900W Channel
• 20 Year Warranty

SPECIFICATIONS:

• Power: 300W into 8Ω, 500W into 4Ω, 900W into 8Ω (Bridged Mono)
• Harmonic Distortion: ≤.005% from 20Hz to 20kHz at 300W
• Noise below full output: -110dB single ended, -113dB balanced
• Slew Rate: >60V/µS
• Power Bandwidth: .5Hz to >100kHz
• Damping Factor: >500 at 20Hz (8Ω)
• Switchable Gain: 23dB or 29dB

OPTIONS:

• Available with silver or black faceplate (3U + .55”)
• 17” (without handles) or 19” (with handles) faceplate available (non-rack mountable)
• Rack mountable Pro Edition available in black