Bryston 28B³ Monoblock Amplifier - Silver - 17 Inch Faceplate - Each

Bryston 28B³ Monoblock Amplifier – Each

What You Need to Know

Bryston’s Ultimate Statement: One Thousand Watts, One Channel

The Bryston 28B³ Monoblock Amplifier is the flagship of the Cubed Series—a full kilowatt into 8 ohms, and up to 1,800 watts into 4 ohms, devoted to a single channel. Handcrafted in Canada around a gigantic dedicated toroidal transformer and 160,000µF of filter capacitance, the 28B³ delivers power that simply never runs out, with distortion measuring 0.005% or less at full rated output.

Available in black or silver, with a 17-inch faceplate or a 19-inch faceplate with handles. Priced and sold individually—a stereo system requires two.

The Patented Salomie Input Circuit

Every Cubed Series amplifier begins with the patented input circuit Bryston developed with the late Dr. Ioan Alexandru Salomie. This super-linear buffer of roughly a dozen active devices provides the first stage of gain while trapping noise and RF grunge before they ever reach the amplifier—with distortion below 0.001%.

At the 28B³’s power levels, that silence matters: a noise floor below -117dB means the first watt is as pure as the thousandth.

Quad-Complementary Output Stage

Bryston’s proprietary Quad-Complementary topology uses four matched output devices per half-cycle, arranged to cancel the crossover distortion that plagues conventional Class A/B designs. The harmonic behavior mimics a pure Class A amplifier—without the heat, weight, or wasted power a true kilowatt of Class A would demand.

With a slew rate beyond 120V/µs and a damping factor over 500, the 28B³ starts and stops the most demanding woofers with absolute authority.

A Power Supply Built for a Kilowatt

Each 28B³ chassis carries its own massive, specially wound toroidal transformer and 160,000µF of storage—dedicated entirely to one channel. Independently regulated supplies feed every gain stage, so the amplifier’s grip never wavers, even at full output into difficult loads.

Individually Measured, Proven in Writing

Every 28B³ runs a 100-hour factory burn-in, then goes to the bench. The serial-numbered measurement sheet packed with each unit documents your amplifier’s actual performance—review samples have measured over 1,200 watts into 8 ohms.

Your Choice of Finish and Faceplate

The 28B³ is offered in black or silver anodized aluminum, with either a 17-inch faceplate or a 19-inch faceplate with Bryston’s classic machined front handles. Rear handles are standard on every unit, and the entire amplifier is convection cooled—no fans, no noise.

Building Your System

Place one 28B³ beside each speaker, fed by balanced XLR from your preamp, and give its heatsinks breathing room. SoftStart circuitry works on a standard 15-amp line, though a dedicated circuit lets a pair of them stretch out fully.

This is the amplifier for the largest rooms and the hardest-to-drive reference speakers—backed by Bryston’s 10-year analog warranty. Remember: one 28B³ powers one channel.

Features & Specifications

1,000 Watts into 8 Ohms, up to 1,800 into 4
Flagship single-channel power that never runs out.

Patented Salomie Input Circuit
Super-linear input stage with distortion below 0.001%.

Quad-Complementary Output Stage
Class A-like linearity at 0.005% or lower distortion.

Massive Dedicated Power Supply
One giant toroidal transformer and 160,000µF per chassis.

Individual Factory Test Sheet
100-hour burn-in and bench measurement, documented per serial number.

Four Configurations
Black or silver; 17-inch faceplate or 19-inch with handles.

Specifications

•          Type: Flagship Monoblock Power Amplifier, Class A/B

•          Power Output: 1,000W @ 8 ohms; up to 1,800W @ 4 ohms

•          THD+N: 0.005% or less (20Hz–20kHz at rated power)

•          Noise: Below -117dB (balanced input)

•          Slew Rate: Greater than 120V/µs

•          Damping Factor: Greater than 500 (20Hz, 8 ohms)

•          Gain: 29dB

•          Inputs: Balanced XLR and Single-Ended RCA (selectable)

•          Outputs: Dual Pairs of Binding Posts (bi-wire ready)

•          Trigger: 5–12V In with Pass-Through Out

•          Standby Power: Less than 0.5W; SoftStart Inrush Control

•          Cooling: Full Convection (no fans)

•          Dimensions: 17" or 19“W x 8.1”H x 16.8“D (18.4”D with front handles)

•          Weight: 93 lbs

•          Finishes: Black or Silver; 17-Inch or 19-Inch-with-Handles Faceplate

•          Sold: Individually (two required for stereo)

•          Warranty: 10 Years (analog)

•          Made In: Canada

Frequently Asked Questions

Do I need two of these?
For stereo, yes—each 28B³ powers one channel and is priced individually. Monoblocks put each amplifier at its speaker with every watt fully independent.

How does the 28B³ compare to the 7B³?
The 7B³ delivers 600 watts from a 5.8-inch-tall chassis. The 28B³ scales the same Cubed architecture to a full kilowatt with a larger transformer, taller chassis, higher slew rate, and a damping factor over 500—Bryston’s absolute best.

Will it work on a standard household circuit?
Yes—SoftStart keeps turn-on inrush from tripping breakers, and a 15-amp circuit is fine for normal listening. For a pair driven hard, a dedicated line is a worthwhile upgrade.

Who is the 28B³ designed for?
It’s for the uncompromising listener with a large room, reference-grade speakers, and a demand for unlimited, unconditionally stable power—a true destination amplifier.

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