In our band there is a problem w/ 2 of our mics always causing feedback thru the monitors. Heres the thing, all the mics are shure beta 58's, the two that are feeding back have cheap mic cables . My beta 58 is connected thru a good braided $45 cable. I can crank my mic to high heavens and never get feedback. The eq's are adjusted the same on all 3 mics. I have tried moving the other two monitors farther away from the two mics and they still feed back. But still, they cant get the volume that my mic gets and I cant turn them up as far as mine, evev though they are all beta 58's and all eq'd the same. Is it the damn mic cords?