Work perfectly. Manufactured on 2006 so technically still under Bryson 20 year warranty. Spent at last 13 years in storage. I am currently using them with my 15” Tannoy Lockwood’s and they are working perfectly. Connectors have been serviced with switch cleaner.

BRYSTON POWERPAC 300 SST MODULAR AMPLIFIER

The Bryston PowerPac 300 amplifier, is a no-compromise, modular, single channel power amplifier delivering 300 watts at 8 Ohms, or 500 watts into 4 Ohms. The PowerPac 300 is a modular monaural version of our very popular 4B SST stereo amplifier but designed to be utilized in applications where portability, sound quality and flexibility are of prime importance.

The PowerPac 300 is a perfect choice for use as a portable power amplifier which can be attached directly to the rear of your loudspeaker. This provides for the use of very short speaker leads resulting in a much improved loudspeaker/amplifier interface. The PowerPac 300 can also be bolted on the wall for utilization in audio/video surround systems (left/right/center/rears) where a non-conspicuous power module is required. A further application would be in multi-room audio systems where single or multiple amplifiers are needed to provide music in adjacent rooms. Finally, with the recent popularity in passively or actively amplifying the individual drivers in your stereo loudspeakers the Bryston PowerPac 300 would be ideal for use in this capacity.

VERSATILE FEATURES:

Allows direct attachment or adjacent placement to loudspeakers

On-wall mounting

Easy application in any multiple driver active or passive stereo system

Balanced or unbalanced operation at the flick of a switch

Gold plated 5-way banana jacks, RCA and XLR connectors

Ground lift switch to reduce annoying hum

Level control adjustment

Detachable power cord.

Specifications:

Power Output

300 watts into 8 ohms

500 watts into 4 ohms

Gain

29dB (Unbalanced)

23dB (Balanced)

Distortion

< 0.007% from 20kHz at 300 watts, IM or THD

Noise

>110dB below rated output

Slew Rate

> 60 volts per millisecond

Power Bandwidth

< 1Hz to over 100kHz

Input Sensitivity

(Unbalanced)

1 Volt in = 100 watts at 8 ohms

1.5 Volts in = 300 watts into 8 ohms

Input Sensitivity

(Balanced)

Selectable 1V or 2V in = 100 watts at 8 ohms

Selectable 1.73V or 3.46V in = 250 watts into 8 ohms

Input Impedance

50 Kohms unbalanced

20 Kohms balanced

Features

Over 2,640 cm/square of heatsinking

Regulated power supplies to all voltage gain stages

Gold plated input and output connectors

Switchable balanced XLR - 1/4" w/ two different gains and

RCA unbalanced inputs

Remote power turn-on 12V, AC/DC (optional)

Dimensions

LxWxH = 17" x 8.4" x 4.5", wt: 23 lbs,

43x21x11.5 cm, wt:10.5 kg

Weight

10 lbs, 4.5kg