Re: PA Question
- From: "William Black" <william.black@xxxxxxxxxxxxx>
- Date: Thu, 24 Nov 2005 21:43:54 -0000
"No Busking" <nobusking@xxxxxxxxx> wrote in message
news:MYCdnYDcSositRveRVn-tA@xxxxxxxxxxxxxxx
> > Any PA will feedback more readily if cranked as high as it possibly
> > will go.
> >
> > If you have a lot of power you won't need to crank the PA as far as it
> > will go.
> >
> > You get it???
> Um, yes, I get it, but you clearly don't.
>
> Care to explain to us what causes feedback?
It's a 'runaway oscillator'.
You've got an amplifier.
To make it an oscillator all you need to do is feed some of the output back
into the input and it will oscillate at its 'resonant frequency'.
The resonant frequency varies depending on a number of factors.
The trick with PA systems is to 'dial out' the room resonant frequency using
a graphic equaliser.
--
William Black
I've seen things you people wouldn't believe.
Barbeques on fire by the chalets past the castle headland
I watched the gift shops glitter in the darkness off the Newborough gate
All these moments will be lost in time, like icecream on the beach
Time for tea.
.
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