I'm hoping someone can help me or point me in the right direction here. I play in an acoustic duo with the following setup: Yamaha 2x400 watt powered mixer 2 fender wedge monitors(individual volume controls) 2 mics(not very good ones, they came with the system) 2-15 inch passive spekers. we play a taylor guitar(expression system) and a martin with both a bridge pickup and an internal mic. these are run through the PA. I'm experiencing a lot of problems with feedback from, I bel;ieve, both the martin guitar and the monitors with relation to mics. I dont really know too much about setting my powered mixer for optmal sound. We play in small clubs with tiny stages and cant really move our speakers(FOH) far away from us. I read somewhere that the monitors should always be placed in front of the mics(which I have never done)and that the output levels for individual channels should be just below peak(o level). And then Eq applied. I always seem to get feedback if too much volume(over 30 percent say) is used on both Main and Monitor. Any ideas?