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question about "feedback"
hi guys,
i was checking out the gain-before-feedback levels of a mixer/mic combo. i got it to where it was about to howl, and then backed the mic input level down just a bit so it was in the "safe" zone. then i brought up the power amp level. i thought it would tip it back over the edge and start to get the "about to howl" situation. but it didn't. how come i could bring the power amp levels up more without feedback, but if i barely increased the gain on the mic channel, it would proceed toward feedback? i thought once you were at the edge of feedback, any increase in gain anywhere in the signal chain would tip it over the edge. but i seem to have gotten away with some extra "gain without penalty" from the power amp. why? my next related question is this: if you are trying to get a PA situation set up, should you turn the power amps way up and then keep the gain controls on the mixer comparatively low to get a better gain-before-feedback ratio? |
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