Bryston 21B Cubed Amplifier

$12,195.00
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The Bryston 21B³ three channel amplifier was crafted to provide superb amplification for your Bryston Active Loudspeaker System. The Bryston 21B³ is essentially composed of a 7B³ and a 4B³ amplifier, which provides plenty of power for a single active loudspeaker. Two of these amplifiers will drive your active system with breathtaking ease and clarity.

The Bryston 21B³ three channel amplifier was crafted to provide superb amplification for your Bryston Active Loudspeaker System. The Bryston 21B³ is essentially composed of a 7B³ and a 4B³ amplifier, which provides plenty of power for a single active loudspeaker. Two of these amplifiers will drive your active system with breathtaking ease and clarity.

Fully active loudspeaker systems dispense with passive crossovers found in conventional loudspeakers in favor of inserting the crossovers before the amplifier. The benefits include increased flexibility of filter shapes, the ability to make fine-grained adjustments resulting in improved on and off axis response (these are often competing objectives in passive loudspeakers), direct coupling of the amplifier to the driver (avoiding losses inherent in passive crossovers), and higher SLP with lower distortion. The Bryston Active Loudspeaker System combines decades of research into acoustics, electronics, amplification, and state of the art components to recreate your recordings with stunning realism.

First to Last Watt Philosphy

A significant part of the design criteria for the new Cubed series was to develop amplifiers that would maintain an ideal power curve from the first watt to the last. Most amplifiers exhibit a power curve where the best noise floor, drive capability and distortion are acheived from about 1/3 power and up. The new Bryston Cubed series amplifiers maintain their ideal power curve starting right from the first watt.

Achieving this starts with a number of design approaches:

  1. Complete freedom from low-level crossover, zero-crossing, artifacts

    Most class-AB amplifierrs have sufficient bias to prevent primary crossover distortion, but secondary crossover distortion is caused by insufficient speed in the driver transistors. The Cubed Series uses very fast drivers to help prevent this, as well as proprietary technology. Bryston's Quad Complementary Output design vastly reduces the capacitance seen by the driver transistors, virtually eliminating storage delay in the output stage that could contribute to nonlinearities in the zero-crossing region.

  2. Continuing efforts to reduce low-level noise. The clarity of level noise

    The clarity of Bryston's designs is enhanced at low listening levels by pushing the noise floor far below the signal level, improving the silence between the notes and enhancing the clarity of the music at low power levels.

  3. Concentration on reducing distortion at all levels, especially high frequencies

    Bryston amplifiers are perhaps the only designs to concentrate so much effort at reducing HF distortion artifacts, and the results are remarkably flat THD-with-frequency curves, sho frequency curves, sho frequency curves, showing almost no tendency to wing almost no tendency to increase distortion as frequency rises. This has the effect of reducing overall haze, helping to pull the quietest passages out of the background.

Additionally, the new Cubed Series employs highly effective RF employs highly effective RF rejection in the power supplies, which traps and eliminates radio-frequency hash from either interfering with or emanating from the amplifier via the power cable or signal cables.


Press and Reviews

Bryston Magazine Guide
Bryston Magazine

Guides & Advice
by Moon Audio

Soundstage Active System Review
Soundstage

by Roger Kanno
Dec. 2018

Specs

Technical Features

Inputs
3x Balanced Inputs (XLR or TRS)
3x Single Ended Inputs (RCA)
Power Capabilities:
1x 600W into 8Ω
2x 300W into 8Ω
1x 900W into 4Ω
2x 500W into 4Ω
Harmonic Distortion (1st Channel)
≤.005% from 20Hz to 20kHz at 600W
Noise below full output (1st Channel)
-113dB single ended, -116dB balanced
Harmonic Distortion (2nd and 3rd Channel)
≤.005% from 20Hz to 20kHz at 300W
Noise below full output (2nd and 3rd Channel)
-110dB single ended, -113dB balanced
Slew Rate
>60V/µS
Power Bandwidth
100kHz
Damping Factor
>300 at 20Hz (8Ω)

Overview

  • Designed to meet the power requirements of a single active loudspeaker
  • Balanced and Single Ended audio inputs
  • Selectable gain at 23 or 29dB
  • No fans or other moving parts
  • Regulated power supplies to all voltage gain stages
  • Convection cooled and housed in a fully aluminum chassis
  • Independent power supplies for each channel
  • Energy storage power transformers maximize dynamic range

Physical

Dimensions
8.1" H x 18.4" D x 17" W (or 19")
Weight
55 lbs (25 kg)

Options

  • Available with silver or black faceplate
  • 17” (without handles) or 19” (with handles) faceplate available (non-rack mountable)

Package Includes

  • Amplifier
  • 20-Year Limited Warranty*
  • 20-Year Warranty


*Only Bryston products purchased from an authorized dealer, like Moon Audio, are covered under warranty.

Bryston analog audio products and loudspeakers are warranted to be free from manufacturing defects for twenty (20) years from the original date of manufacture. The warranty includes parts and labor. Speaker warranty is limited to the first time buyer and is non-transferable.

Bryston will remedy the problem by repair or replacement, as they deem necessary, to restore the product to full performance. Bryston will pay return shipping costs for the full length of the specific product’s warranty.

For further details, visit Bryston's website.

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