4B³

About the 4B³

The Bryston 4B³ (4B Cubed) is the latest iteration of Bryston's legendary 4B amplifier series, in continuous production since 1978 and now in its 6th generation. This true dual-mono design houses two fully independent amplifiers with separate power supplies and large stacked toroidal transformers (540W each), ensuring channel isolation and effortless power delivery. It incorporates a patented Salomie input circuit developed with Dr. Alexandru Salomie, featuring 12 active devices for extremely low distortion (<0.001% measurable), high linearity, and superior rejection of RFI, EMI, and common-mode noise. The Quad-Complementary output stage combines Class-A-like sonics with Class-AB efficiency. Fully convection-cooled with no fans, it offers switchable gain (23dB/29dB), balanced XLR/TRS and single-ended RCA inputs, bridged mono mode (900W into 8 ohms), DC trigger, SoftStart sequence, and legendary reliability backed by a 20-year warranty. Renowned for tight bass control, transparency, dynamic range, and neutrality, it's ideal for demanding speakers in high-end systems.