Re: [Harp-L] RE: what makes a mic prone to feedback?

[Conrad Gleich <radconradlleyire@xxxxxxxxx>]

c b low

--- Greg Heumann <greg@xxxxxxxxxxx> wrote:

> In my experience, I believe there are only a few
> factors. One is  
> sensitivity of the mic - the mic that puts out more
> signal than  
> another at a low level will feedback more. Another
> is resonance -  
> some mics live in housings where the back side
> creates a resonant  
> chamber. I found this out when the screw fell out of
> a little hole on  
> the back side of my 520D - and I always thought it
> was sealed well  
> enough that the back side didn't have much effect -
> but with that  
> hole opened it was definitely worse than with it
> sealed, although  
> there is another tiny hole that doesn't seem to have
> much effect.  
> Finally, phase makes a difference. By phase I mean
> whether the amp's  
> speaker moves out when the mic's diaphragm moves in,
> or vice versa. I  
> installed a phase-switch switch in one of my amps
> (it reverse the  
> polarity at the speaker) - and I was surprised at
> the difference in  
> feedback. Either position will feed back, but at
> different  
> frequencies and at different levels. If you ever
> play behind your amp  
> and find it feeds back less, consider switching the
> phase.
> 
> But the most important factor is simply the output
> level - some mics  
> are much hotter than others. Of course if you do NOT
> adjust volume at  
> the amp, the hotter mic will generate a louder
> sound, perhaps enough  
> to create feedback. Many folks blame this on the mic
> - but if you  
> adjust the volume so that you got the same loudness
> for two different  
> mics, you'll probably find they aren't very
> different.
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> 

thanks,  very edifiying for me. c-rad



		
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