In Reply to: RE: PA backwash posted by smcdonie@uwsp.edu on September 26, 2008 at 13:30:37:
Which 87? There are two Betas to choose from. One is tighter than the other. The 87s have lots of grab, are very sensitive. The Audix are just the reverse, requiring more gain.
It comes down to knowing how to set gain structure, set up the FOH and MON systems properly.
Again, she is not having feedback per se. She is hearing the cabinet resonate at specific frequencies. All of the molded boxes are going to do that somewhat. You need a speaker with mass and internal bracing to minimize the phenomenon.
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