Bryston 4B³ (Cubed) Stereo Power Amplifier
#3 in Stereo Amplifiers · Rated 4.6
Dual‑mono, 300W/8Ω, 500W/4Ω Bryston Cubed
Bryston’s 4B³ is a legendary dual‑channel power amplifier known for its ironclad build, dual‑mono regulation, and outstanding low‑noise performance. Rated at 300 watts per channel into 8 ohms and up to 500 watts into 4 ohms, with a bridged mono option delivering 900W, it remains a reference for reliability and musical neutrality. Its convection‑cooling design and rugged aluminum chassis make it suitable for serious audiophile rigs and larger loudspeakers. The 4B³ uses independent power supplies per channel, selectable gains, and both balanced XLR and single‑ended inputs, offering flexible integration with high‑end preamps and multi‑room systems. Bryston backs its products with a 20‑year analog warranty, underscoring confidence in long‑term performance. Sources: Bryston official product pages; dealer listings with pricing. ([schroederhifi.com](https://schroederhifi.com/products/bryston-4b3-cubed-stereo-amplifier?utm_source=openai))
Features
- 300W into 8Ω, 500W into 4Ω; 900W bridged
- Dual independent power supplies per channel
- Balanced XLR and RCA inputs; selectable gain
- Convection cooled, fully aluminum chassis
- 20‑year analog warranty
Pros
- Neutrally voiced, very controlled bass
- Excellent build quality and warranty
- High resale value and long legacy
Cons
- Pricing places it firmly in premium territory
- Heavy and large footprint