Bryston 4B³ Power Amplifier
Best high-end amplifier for audiophiles driving demanding, power-hungry speaker systems.
This is the definitive workhorse for those who prioritize absolute sonic transparency over aesthetic flair. Its dual-mono architecture delivers relentless, clean power that brings even the most demanding speakers to life, though its utilitarian design makes it clear that the focus remains entirely on what you hear, not what you see.
$5621.25
at
Audio Advisor
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)
Input Impedance, Individual Mode
Single Ended ≈60k ohm; Balanced + ≈60k ohm; Balanced - ≈12.5k ohm
Input Impedance, Bridged Mode
Single Ended ≈10k ohm; Balanced + ≈10k ohm; Balanced - ≈10k ohm
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