Bryston 3B Cubed Stereo Amplifier
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Bryston 3B Cubed Stereo Amplifier
Overview
The Bryston 3B Cubed (3B³) is a dual-mono, two-channel power amplifier rated at 200 watts per channel into 8 ohms and up to 300 watts into 4 ohms. Bryston calls it one of its smaller amplifiers, yet says it features all the same technology found in the 4B, with one big advantage: a shallow chassis that suits tight equipment spaces.
Its roots go back to 1973, when Bryston engineer Chris Russell took his PRO 3 prototype to a Toronto recording studio and left with an order for two. Bryston says today's 3B³ is twice as powerful as that original. Each channel has a fully independent power supply, including its own transformer, and the patented Salomie circuit used in all Cubed Series amplifiers keeps distortion under 0.005% (THD+N, 20Hz to 20kHz at rated power).
Balanced XLR and single-ended RCA inputs, switchable 23dB or 29dB gain, and a DC trigger make it straightforward to integrate. It's fully convection cooled with no fans, draws under 500mW in standby, and uses a microprocessor-controlled SoftStart sequence that won't trip circuit breakers.
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Depth is where the 3B³ stands out: the chassis is 10.75 inches deep (12.75 inches with the 19-inch handles), which Bryston notes makes it especially useful where mounting depth is limited, such as shallow cabinets and media furniture. Leave space above and around it for convection cooling, and use the gain switch to match your preamp's output.
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Why the Bryston 3B Cubed Stands Out
200W Per Channel
200 watts into 8 ohms and up to 300 watts into 4 ohms, per channel.
Shallow-Depth Chassis
10.75 inches deep, which Bryston says suits shallow mounting applications.
Dual-Mono Power Supplies
Each channel has a fully independent power supply, including its own transformer.
Salomie Input Circuit
The patented circuit Bryston uses across its Cubed Series amplifiers.
Fanless Convection Cooling
Fully convection cooled, with no noisy fans.
Switchable Gain and DC Trigger
23dB or 29dB gain, plus a DC trigger for automated on and off.
Buyer's Guide
Who It's For
- The Tight-Space Installer: Needs Bryston amplification in a shallow cabinet or rack.
- The Stereo Listener: Wants 4B-family technology at 200W per channel.
- The Integrated System Builder: Wants XLR inputs and trigger control for an automated system.
How It Compares
The 3B³ sits between the compact 2.5B³ (135W per channel) and the 4B³, which delivers 300W per channel into 8 ohms (500W into 4 ohms). Bryston says the 3B³ shares the 4B's technology, with the 3B³'s shallower chassis as its key practical advantage.
Bryston 3B Cubed Stereo Amplifier Specifications
| General Information | |
|---|---|
| Model | Bryston 3B Cubed (3B³) |
| Brand | Bryston |
| Product Type | Two-channel power amplifier, dual-mono |
| Options | 17" or 19" faceplate (19" includes front handles); PRO version with 19" rack-mount panel and rear channel trim pots (-14 to 0dB) |
| Performance | |
| Power Output (per channel) | 200W @ 8 ohms; 300W @ 4 ohms |
| Frequency Response | <1Hz - 100kHz (-3dB) |
| THD+N | <0.005% (20Hz - 20kHz, rated power, 8 ohms) |
| Noise | RCA: <-106dB; XLR: <-111dB |
| Slew Rate | >60V/µs |
| Damping Factor | >500 (20Hz, 8 ohms) |
| Inputs & Control | |
| Inputs | Balanced XLR and single-ended RCA |
| Gain | Switchable 23dB or 29dB |
| Mode | Stereo or bridged |
| Trigger | DC trigger for automated on/off |
| Start-Up | Microprocessor-controlled SoftStart |
| Standby Power | <500mW |
| Physical Specifications | |
| Dimensions (W x H x D) | 17" or 19" x 8.1" x 10.75" (12.75" with front handles) |
| Weight | 35 lb (16 kg) |
| Cooling | Fully convection cooled (no fans) |
| Enclosure | Machined and anodized aluminium |
| Colours Available | Silver or black faceplate |
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