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:	post by live sound guy at 2008-10-02 17:26:26

You need to get real speakers before making any kind of honest judgement.

Second - you mention that the feedback is there, albeit much less, without the effects. This tells me that the processor is definitely affecting the amount, but is not the cause.

There are many causes of feedback, from cupping the mic (don't do it, i don't care how cool you think it looks) to poor gainstaging to speakers being too close to mics. An SM57 is a fairly standard and low-z mic to begin with, that's not the problem.

What kind of board/amp setup are you using? How is the gain staged (input trim/EQ/output volume relationships)? If the board has EQ - which it should - try to turn down the higher frequencies a bit. Also, how is the gain set on the FX machine? Is it outputting a very high or low signal? How is the input trim on the board? IF you have the output of the FX machine set low and make up for it by cranking the input on the board, you'll get more feedback.

There are a million causes for feedback and you didn't quite give enough info to diagnose it. Also, using a guitar cab is awful - stop it immediately. You could potentially be damaging the amp or the speakers due to impedance issues as well.

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