Bryston 4B³ Cubed Stereo Power Amplifier
Best high-end amplifier for audiophiles driving demanding, power-hungry speaker systems.
Experience unparalleled audio fidelity with the Bryston 4B³ Cubed Stereo Power Amplifier. This highly acclaimed dual-mono amplifier delivers exceptional clarity and robust power, making it a cornerstone for high-end audio systems. It offers 300W per channel into 8 ohms, 500W into 4 ohms, and a bridged mono option for 900W at 8 ohms. Engineered with independent power supplies and transformers, it ensures pristine sound reproduction. Featuring versatile input options and Bryston's legendary build quality, it's backed by a twenty-year warranty for enduring performance.
$5621.25
Owner Satisfaction
4.8
/ 5
Category Rank
37
/ 1684
#37 in Power Amplifiers
Price vs Category Average
-32%
Below average
Channels
2
Who it's for
- Long-term investors seeking lifetime equipment reliability
- Audiophiles driving power-hungry, low-impedance speaker systems
- Purists demanding uncolored, accurate sound reproduction
Who should skip it
- Music lovers preferring a warmer, more forgiving sonic character
- Budget-conscious buyers prioritizing value over flagship performance
- Listeners with limited rack space or physical strength
Performance breakdown
Power Delivery
Effortlessly drives even the most demanding high-end loudspeakers with absolute authority.
Signal Purity
Near-zero distortion ensures the music remains transparent and completely uncolored.
Build Integrity
Legendary construction standards backed by an industry-leading twenty-year warranty.
Channel Separation
Dual-mono architecture creates a remarkably wide and precise soundstage.
Connectivity Versatility
Flexible input options accommodate a wide range of professional and audiophile gear.
System Scalability
Bridging capability offers a massive power upgrade for future system expansion.
Key Specs
Channels
2
Faceplate Size Options
17" or 19"
Color Options
Black or Silver
Power output
300 watts per channel at 8 ohms
Power output
500 watts at 4 ohms
Power output (Bridged Mono)
900 watts at 8 ohms
Gain
High 29 dB (28.28 V/V); Low 23 dB (14.14 V/V)
Sensitivity
High: 1.0V (100W), 1.7V (300W); Low: 2.0V (100W), 3.5V (300W)
Features
- Dual-mono design for superior channel separation
- Robust power for demanding speakers
- High-fidelity audio reproduction
- Low distortion and noise floor
- Versatile input options (XLR, TRS, RCA)
- Legendary Bryston build quality
- Bridging capability for increased power
- Twenty-year warranty
What customers say
The Bryston 4B³ is overwhelmingly regarded as a reference component delivering transparent and authoritative performance. Users praise its effortless power, noting its ability to drive difficult speakers with absolute control and a neutral sonic signature. A major theme is the exceptional build quality, described as robust, which, paired with the 20-year transferable warranty, assures long-term investment confidence. While premium priced, owners feel the uncompromising performance and reliability fully justify the cost, positioning it as an endgame amplifier. The only noted drawback is its substantial size and weight.
Know before you buy
The dual-mono design uses independent power supplies and transformers for each channel. This configuration minimizes crosstalk and interference, resulting in superior channel separation and a more precise, expansive soundstage.
Yes, the 4B³ is fully capable of driving 4-ohm speakers. It delivers 500 watts per channel into a 4-ohm load, providing plenty of headroom for demanding speaker designs.
The 4B³ features a bridging capability that allows you to combine both channels into a single, high-power output of 900 watts at 8 ohms. This is ideal for users requiring extreme power for a single, difficult-to-drive speaker.
No, the 4B³ is a dedicated power amplifier focused exclusively on audio amplification. It does not include a digital-to-analog converter or remote control functionality.
The amplifier is highly versatile, offering XLR, TRS, and RCA input options. This allows for easy integration with a wide variety of preamplifiers and professional audio equipment.
Bryston’s twenty-year warranty is a testament to their build quality and covers defects in materials and workmanship under normal use. It is one of the most comprehensive warranties in the high-end audio industry, ensuring long-term reliability.
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