[BC] ...Seriously pal?...

[Dave Dunsmoor]

>> I put an out-of-phase mike in the ceiling of a recording booth to cancel
>> airconditioner rumble and it works great.  no kidding,
>
>> ----------------
>
> That's a great idea and I think I might try it.  Right now I am  
> doing my recording in the morning before the A/C comes on.  My RTA  
> shows a lot of energy in the 32 and 64-Hz bands when it is on.
>
> But, would it work better if the mics had an identical frequency  
> response?  Or is this unnecessary?

I think that would make the project easier to start with.

You'll likely have to adjust amplitude of the out of phase mix to do  
what you're trying to do, and to do that you might want to use an  
equalizer, but it should work, and probably work well.