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New in Box Bryston 4B-ST Power Amplifier - $2,500 (berkeley)
condition:
like new
make / manufacturer:
Bryston
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Perfect for Bowers Wilkins 803 Speakers. also JBL speakers
Bryston amplifier is in new in box condition.
Original Box and paking Material included.
Solid-state stereo power amplifier
<0.007%, 20 Hz- 20 kHz @ 250 Wpc
Gold-plated connectors
Finish
Black
Made In
Canada
Frequency response
1Hz–100kHz, ±3dB for 1W output
Total harmonic distortion
<0.007%, 20 Hz- 20 kHz @ 250 Wpc
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
Input impedance
50k ohms unbalanced, 30k ohms balanced
Polarity
non-inverting
"The Bryston 4B-ST stereo amplifier consists of two amplifier modules, each with its own +/- 85v power supply. Each of the two amplifier modules uses eight of Bryston's custom power transformers for a total of 16 output devices.
The two channels may be operated independently, (at 250 Watts per channel @ 8 Ohms, 400 Watts @ 4 Ohms), or combined to form a single 800 watt monaural amplifier into 8 Ohms." And distortion is less than 0.007% from 20Hz to 20kHz!
The 4B-ST has a power switch front and center, then out back there's a stereo/mono switch, gold-plated input/output connectors, balanced XLR and unbalanced RCA inputs, and a 12V trigger that offers an adjustable turn-on delay of 0 through 4 seconds. And the ground-lift switch? It actually "lifts" the internal circuitry while still grounding the chassis to aid in resolving potential ground-loop hum issues.
This amp was fully tested on our workbench to meet or exceed manufacturer specifications using appropriate pro-level testing equipment, and powered for a solid run in our listening room with smiles all around.
Dimensions: 5-1/4" H, 19" W, 15-1/2" D.