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SYSTEM FADES IN & OUT ON IT'S OWN

N

nightfly61

Guest
The club I work at has a sound system where the amp rack (which includes a crossover, e.q & amps) is behind the stage about 60 feet from the sound board & d.j system in the booth.
It's like the mids dump out on their own when I least expect it. It gradually fades out, like someone hit a "loudness button". Then after while it sometimes comes back to how it's supposed to sound. I've ruled out the board since several different boards have been tried & it still does the same annoying thing. I've blasted the amps out with canned air & once a year I clean the plugs & jacks with amonia.
Our station sometimes does broadcasts from there & you can hear the "tinty badness" loud & clear across the air in the background (not to mention no one dancing because of the sound)
What could be causing this? Thanks!!!
 
Exercise any and all Push-off Push-on Audio bypass buttons in the system.
I just had the same issue in an on-air audio processor 2-3 weeks ago, See "dangit" on Engineering board.
 
So only blast the buttons & pots out with air?
How about "CRG" Electrical Grade "Lectra Clean"?
 
Air won't help. 'Letctra-clean is a solvent only and will clean.
De-oxit D5 has a chemical that removes oxidation and sulfation from the surface of such moving contacts and leaves behind a lubricating and protecting layer to slow the return of oxidation and sulfation. Noisy switches and potentiometers become magically quiet.
Buy 2 or 3 cans, you'll never want to be without it.
 
Tom Wells said:
Air won't help. 'Letctra-clean is a solvent only and will clean.
De-oxit D5 has a chemical that removes oxidation and sulfation from the surface of such moving contacts and leaves behind a lubricating and protecting layer to slow the return of oxidation and sulfation. Noisy switches and potentiometers become magically quiet.
Buy 2 or 3 cans, you'll never want to be without it.
Click to expand...
Bought some & cleaned every button, slide, & dial pot on the rack. It's still doing it. Could the cords running from the booth to the backstage rack be old & oxidized on their plugs?

It's like all the depth is just "sucked out". ??? Thanks!
 
One channel or both? Could be cables, but wiggling should show which might be a poor connection and I'd think you'd have found that by now. Next try feeding the board into a little portable guitar amp right there in the booth with diff cables..
It could be the amps you're feeding.. try the portable guitar amp at the end of the existing cables.
It may be time to open the main power amp and look for connectors internally.
The fact that it's the midranges could be related to the eq, or it could be a failing electrolytic capacitor somewhere in the signal.
The bass is really still OK when this happens?
You'll have to substitute or bypass equipment one piece at a time to isolate it.
 
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