Dankology Posted April 15, 2021 Share Posted April 15, 2021 The rehearsal room is being readied for action again... We've got a couple of Mackie (or possibly Tapco) Thumps that haven't been used in anger for some considerable time - active speakers fed from a Behringer XR18. When I was giving everything a test run last week one of them gave a little crackle which very quickly built up to a quite terrifying loud static sort of noise - pulled the plug but exactly the same thing happened a few minutes after plugging in again. It's a very electrical sounding noise, if that makes sense. Any thoughts on how to bottom this out? I was wondering about possible condensation inside or maybe a a dodgy solder joint that starts playing up as things get warmer? Quote Link to comment Share on other sites More sharing options...
itu Posted April 15, 2021 Share Posted April 15, 2021 Is every piece of equipment in the same phase (230 VAC)? Sure a cold solder joint is possible, although they can be complicated to find. How about loose cables, screws or broken PCBAs? 1 Quote Link to comment Share on other sites More sharing options...
Dankology Posted April 15, 2021 Author Share Posted April 15, 2021 The electrics *should* be sound - it's a small room in a domestic property that was recently refitted and rewired by the owner's (professional) electrician friend - although stranger things have happened, I I suppose. The cables are ok in as much as the speaker misbehaved even with different xlrs and kettle leads. I'll have to figure out how much a replacement will cost vs my time poking at it with a screwdriver. Thank you for the pointers! 1 Quote Link to comment Share on other sites More sharing options...
Dan Dare Posted April 16, 2021 Share Posted April 16, 2021 As it's only one of the cabs that makes the noise, that would rule out mains issues. By "static" noise,, I take it you mean a kind of hissing roar. I had a similar experience once with an amp. It turned out to be a capacitor that had failed. Resist the temptation to poke around and take it to a repairer is my suggestion. 2 Quote Link to comment Share on other sites More sharing options...
Dankology Posted April 16, 2021 Author Share Posted April 16, 2021 It sounded more like being in a tent that someone was whipping increasingly quickly and forcefully... I think I've got a recording of it that I'll try to post. But you're right - if it isn't as obvious as a visibly disconnected component, I'll be out of my depth. Quote Link to comment Share on other sites More sharing options...
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