The Mudcat Café TM
Thread #167014   Message #4023212
Posted By: GUEST,Ray
11-Dec-19 - 04:44 PM
Thread Name: Tech: PA goes berserk
Subject: RE: Tech: PA goes berserk
“Saying it was from an unstable system is just a fancy way of saying "I dunno. Somepn musta gone wrong."”

As I said, it’s impossible to say what went wrong but old equipment gathers dust and grot in its innards. Something as simple as grot on one of the potentiometers can limit sound output and vibration or the equipment heating up can dislodge the dust/grot and result in an increase in volume. Try unplugging all the mics and turn the knobs. If yiu hear a rough sound or crackle they could well need cleaning..

There are a whole host of other potential issues. I turned up at a gig a few years ago and my AER amp refused to output any sound. In discussion with the manufacturer, I discovered that the speaker is wired/switched via the headphone output (i.e. the speaker is supposed to go off when yiu plug the headphones in. I’ve never used it with headphones and there was corrosion in the socket which effectively shorted the speake out hence no sound.