I've been doing wedding disco's for friends/family for a year or so and I'm using a combination of some second hand equipment from a mate, and a few bits I've bought on their advice. From reading a few discussions online I'm now a bit concerned that my speakers and amp may not be the correct match for impedence and/or watts.
I've had a few occasions now where the sound has suddenly cut out. So I turn everything off, wait for about a minute, turn it all back on and the sound comes back. I thought it was because the Amp was up too high so I've since been trying to limit to just turning it u