Bryston 4B Amplifier NRBBryston  4B Amplifier NRB 250 Watts per Chanelp.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px 'Helvetica Neue'; color: #454545} p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px 'Helvetica Neue'; color: #454545; min-height: 14.0px} span....1199.00

Bryston 4B Amplifier NRB 250 Watts per Chanel [Expired]

no longer for sale

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2 Bryston 4B NRB

At 250w per channel this professional quality amplifier will be able to drive just about any speakers with authority and precision.  Bryston is known for making amps equally suitable for home or studio which I'm my opinion says a lot about their accuracy and dependability, two of the most important aspects when choosing an amplifier for the recording studio.  

This particular unit is super clean and has been well cared for.  It has little signs of use, with no noticeable scratches or dents.  

On the back you'll find all sorts of options making this amp super flexible including selectors for mono/stereo operation, balanced single ended inputs and ground lift, which can be very handy in reducing hum or ground loops. 

On the front you'll find a power switch, rack handles, rack mounting holes and let/right channel indicator leds.  

The unit has been bench tested for both power output and THD and is working well within spec... no big surprise. 

Amp is available for audition in my private listening room in a Ridgewood NJ by appointment.  There is also pickup available in Union Square

Great review from stereophile

Some specs. 

Description: Solid-state stereo power amplifier. Output power: 250W continuous into 8 ohms (24dBW), 400Wpc rms continuous into 4 ohms (23dBW); 800W continuous into 8 ohms in bridged mode (29dBW). Current delivery: 16A continuous, 48A peak, per channel. Frequency response: 1Hz–100kHz, ±3dB for 1W output. S/N Ratio: hum and noise, 108dB below rated output, 90dB IHF. Input sensitivity: 1.4V for 250Wpc into 8 ohms. Voltage gain: 30dB. THD+noise: 20Hz–20kHz, 0.01%. IM distortion (60Hz+7kHz, 4:1, SMPTE method): less than 0.01% at rated power. Damping factor: greater than 500 at 20Hz, at 8 ohms (equivalent to an output impedance of less than 0.016 ohms). Input impedance: 50k ohms unbalanced, 30k ohms balanced. Polarity: non-inverting.

Dimensions: 16 3/16" (411mm) W by 7 1/8" (181mm) H by 13½" (343mm) D. Weight: 40.1 lbs (20.2kg) net.

Price: $2095, $2295 with optional LED display; TXH-approved version costs $2245 (1992); $2397 (4B-ST, 1999); $3550 (4B-SST, 2007). Approximate number of dealers: 70 (1992); 200 (2007).

Manufacturer: Bryston Limited, P.O. Box 2170, 677 Neal Drive, Peterborough, Ontario K9J 7Y4, Canada. Tel: (705) 742-5325. Fax: (705) 742-0882. US: Bryston Service USA, 30 Coventry Street, Newport, VT 05855. Tel: (802) 334-1201. Fax: (802) 334-6658. Web:

Seller Information

skyfi  Verified Dealer

Last 12 months

Member since January 2012