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The electrics of Live Sound
Old 6th September 2011
  #1
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The electrics of Live Sound

Hey folks, thanks in advance for the time, I've been mixing bands and setting up small to medium largeish PA's for about 4 years now. I rarely need to deal with 3 phase stuff my self, but if I have to, I'm always pissing off whoever's above me with questions like "will I get blown up?" It has been increasingly apparent that my electrical knowledge could do with a bit of dusting off. Does anyone know any good literature/resources that could help along with some electrical (and electronic actually) issues especially as insofar as it pertains to live sound....or studio sound I suppose!
Thanks again,
Garry
Old 8th September 2011
  #2
Lives for gear
 

220 V = works just like the balanced signal from a microphone cable, it's just WAY more power. 2 out of phase signals down separate wires, with a ground in case one signal manages to power up something it shouldn't.

110V = Wire up an XLR to unbalanced 1/4". You'll have to tie one of the signal leads from the mic to the shield on the 1/4" make it work. So, in the mic cable, one wire is signal, the other two are ground.

So is the power in your walls. The hot wire is a signal created from 1/2 of a 220 feed, and the other two are really ground. (Wise people and sparkys will call one "cold" and the other "ground" though. They DO make a difference when it comes to playing with GFI's, and one wire is heavily insulated & designed to return from the hot side, the other is for safety purposes.)

3 phase= 3 identitcal 60hz sine wavs, on 3 different tracks playing 333ms apart....make an electrician figure it out, getting it wrong makes cool fireworks, but a really nasty smell. heh

As far as books, I have no idea. My dad worked for the power company...

todd
Old 8th September 2011
  #3
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cheers for that insight! that makes a bit more sense now!
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