Correct Procedure for Switching on/off Power Amplifier (Bryston 4bsst2)

Posted by: Swamy Ayyappa on 10 November 2016

Hi there,

I am currently using a Bryston 4bsst2 Power Amplifier, my question is in regard to on/off procedure. I currently turn off and on my power amplifier via a powerboard switch, I do not turn on or off my amplifier using the switch on the amplifier but instead use my powerboard to turn on and off my amplifier.  I was wondering whether or not by turning on/off via my power board is it damaging my amplifier as opposed to using the switch on the amplifier.

Thanks

Posted on: 10 November 2016 by Adam Meredith

Slight sense of deja vu - https://forums.naimaudio.com/to...000#1566878605290000

and, most recently, somewhere is this - https://forums.naimaudio.com/to...wer-consumption-wemo

Posted on: 10 November 2016 by Innocent Bystander

For a definitive answer I suggest asking Bryston directly. However, AFAIK switching off at the mains plug is doing no more than operating the rocker switch at the back of the amp, which when first turned on powers up the amp fully, without first going into the standby mode, and IIRC is a circuit breaker designed to power off the amplifier automatically in event of a fault. The only potential disadvantage is if leaving in standby mode between using might minimise any settling time after turn on, which you would not benefit from doing a cold start.

Nice amp! You could of course leave power on and use a remote trigger (hardwired) - with an active triamp rig I have (not Bryston), I use current sensing switches to turn all on in the correct order automatically when the preamp is turned on for convenience given the number of units and importance of correct order - but if those amps were Bryston I'd rig something using the trigger facility.

Posted on: 10 November 2016 by fernar

Assuming that you have other devices also connected the Powerboard, I would only switch on the 4BSST2 using the amps power switch.... the reason being is that when the 4BSST is switched on there is a peak of current as the amp starts up -  through I know it is limited to some extent by the amps internal circuit logic - but nevertheless in my mind, its better to power up the other devices on your powerboard and then finally switch on the Bryston via it's own power switch....

If the other devices on your powerboard are Naim equipment - and I am assuming that this is the case sine this is a NAIM forum - the Naim devices should be left on all the time, as they sound better 'warmed up' and can take an age to get to this state after initial power up

Posted on: 10 November 2016 by Brilliant

I ran a 4BST with a tube pre-amp for a few years. If the SST is like the ST in this regard - my advice is to make sure the Bryston is always switched on LAST. Any component that switches on with a spike will likely over extend your speakers if the amp is on. The ST switched on pretty fast, so in a power brown out, it the pre lags it - you have a situation! I suspect it was safest with a Bryston pre.

Posted on: 10 November 2016 by Innocent Bystander

That is good advice for all systems - power amp on last, and off first.