Bryston
4B3 4B Cubed
Introduced 2016$5,695 MSRP
The 4B³ is the seventh generation of Bryston's benchmark 4B stereo power amplifier line (dating back to 1978), built as a dual-mono, solid-state design with two independent toroidal-transformer power supplies and Bryston's patented low-noise Salomie input stage. It can run as a 300W/channel stereo amp or be bridged to a 900W monoblock, and is backed by Bryston's signature 20-year warranty.
MSRP
$5,695
Used market · Excellent
$6,730
+18% vs MSRP
as of Sep 1, 2026MSRP to used market
From $4,300 at launch to $6,730 today.
Specifications
- Price
- $5,695 USD launch (2016)
- Inputs
- balanced XLR, RCA, selectable gain
- Weight
- 28.6 kg / 63 lbs
- Outputs
- speaker binding posts
- Topology
- Dual-mono, solid-state, Quad Complementary output stage
- Slew rate
- >60 V/µS
- Dimensions
- 432 x 160 x 395 mm / 19 x 6.3 x 16.2 in
- Rated power
- 300 W into 8Ω; 500 W into 4Ω; 900 W into 8Ω bridged mono
- Power output
- 300W x2 @ 8 ohms, 500W x2 @ 4 ohms
- Damping factor
- >500 at 20Hz (8 ohms)
- Power bandwidth
- 0.5 Hz to >100 kHz
- Switchable gain
- 23 dB or 29 dB
- Harmonic distortion
- ≤0.005% from 20Hz to 20kHz at 300W
- Dimensions w x h x d
- 432 x 160 x 395 mm / 19 x 6.3 x 16.2 in
- Noise below full output
- -110dB single-ended, -113dB balanced
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