LITTLEWING Posted November 6 Share Posted November 6 My combo has always done the loud ‘thump’ thing switching on and I can see the speaker visibly jump forwards and return. Can I disconnect the speaker (it has a jack on the rear) before and reconnect after switching on or wouldn’t the amp like it, making sure the master volume is down? Quote Link to comment Share on other sites More sharing options...
Bill Fitzmaurice Posted November 6 Share Posted November 6 That thump is normal, more or less. Better quality amps don't do that. Pulling the plug would be a bad idea if it's 1/4 inch, as that could short the output when you plug it back in and cause serious damage. 4 Quote Link to comment Share on other sites More sharing options...
PaulWarning Posted November 6 Share Posted November 6 one of my Trace amps thumps the other doesn't, I always assumed it was some sort of capacitor fault, it's never damaged the speaker Quote Link to comment Share on other sites More sharing options...
Dan Dare Posted November 13 Share Posted November 13 Take Bill's advice. Better amps don't do that, because they have protection circuitry and a relay which mutes them at switch on until the voltage in the output transistors has stabilised. That circuitry also helps guard against shorts, so if your amp bangs at switch-on, it doesn't have any protection. 1 1 Quote Link to comment Share on other sites More sharing options...
three Posted November 14 Share Posted November 14 On 06/11/2024 at 19:44, PaulWarning said: one of my Trace amps thumps the other doesn't, I always assumed it was some sort of capacitor fault, it's never damaged the speaker I've had this with some Trace amps too - especially older models (which were otherwise brilliant!). Thanks @Dan Dare for the explanation - that makes a lot of sense. I have an Agi DB750 that's entirely quiet as it has diagnostic and protection circuits/relays that are activated at switch on (start up is delayed by around 20 seconds). I also have powered monitors (ATC) that are perfectly silent at power-up but present a pronounced bump at power-down. The manual alludes to this and indicates that it's entirely normal and non-problematic. A bit of a surprise as most of the amps I've used either have almost no (or a relatively small) thump at power down Quote Link to comment Share on other sites More sharing options...
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