4B-NRB vs Parasound NC 2250v2
The NC 2250v2's power @ 8ω is 275W against the 4B-NRB's 250W, its signal-to-noise 114 dB against 100 dB, and its thd 0.020% against 0.010%. Both share power @ 4ω (400W).
AI-generated product photo — not official manufacturer imagery.
AmplifiersPower AmplifiersDiscontinued
Estimated price (community-sourced)
$1,250
Around — community and catalog average, updates slowly
About the 4B-NRB
The Bryston 4B-NRB is a class-AB2 dual-mono stereo power amplifier renowned for its rugged construction, exceptional reliability, and powerful performance. Introduced as an evolution of the original 4B from 1976, the NRB version features improvements like higher rail voltages (85V), multiple small filter capacitors, toroidal transformers, balanced inputs, input buffering, and a soft-start circuit. It excels in bass control, speed, and current delivery (up to 40-50A peaks), making it ideal for dynamic loudspeakers. Popular in studios and hi-fi setups since the late 1980s/early 1990s, it offers bridged mono operation and comes with Bryston's legendary 20-year warranty. Units from that era remain functional today.
Specifications
Power Specifications
Amplification power output and characteristics
- Power @ 8Ω
- 250W @ 8Ω
- Power @ 4Ω
- 400W @ 4Ω
- Amplifier Class
- AB
- Damping Factor
- >500
- Minimum Impedance
- 4Ω
- Input Sensitivity
- 1.3V RMS
- Input Impedance
- 50Ω
Analog Output
Analog signal output specifications
- THD
- 0.010%
- SNR
- 100 dB
- Output Impedance
- 0.016Ω
Physical Dimensions
Size, weight, and appearance
- Dimensions
- 483 × 133 × 394 mm (W × H × D)
- Weight
- 20 kg (44 lbs)
Key Specifications
Power: 250W
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions