Re: [Harp-L] Speakers, mics and phase

[Joel Fritz <jfritz666@xxxxxxxxxxx>]

That's some cool stuff. 

gregnospam wrote:

> Yes- even with a single speaker, there is a phase relationship  
> between the mic and the speaker that can help to accentuate, cancel  
> or alter feedback. Imaging holding your mic in front of the speaker,  
> facing it. If the mic's diaphragm moving in (away from the speaker)  
> results in a signal that pushes the speaker cone out, (think, waving  
> both hands back and forth in the same direction) then the two are  
> sort of "coupled" and feedback will be likely. If they move in  
> opposite directions (think moving your hands toward and away from  
> each other, like clapping) they have a natural phase cancellation  
> that can reduce feedback..
>
> Now - the fact is it matters where you are in terms of wavelengths of  
> distance from the speaker, but for yucks I wired one of my  
> Kalamazoo's up with a speaker-phase-reversing switch. I can get  
> feedback in either direction but the feedback tone occurs at a  
> different frequency if its in phase than if it is out of phase - and  
> I can get the volume knob a little higher before feedback when the  
> switch is in one position vs. another. 
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