It seems I get great voice sound from my karioke machine (don't laugh, it was free) one day and I get not so great sound out of it the next....and ton of feedback...plus, I crank the thing to get it to sound good and loud.....I bought another small amp thinking it was about the same size as the speaker in my karioke machine, and feedbacks like crazy too.....I would really love to have like some sort of a PA system...but of course that costs money...so what else would be another good thing to sing through...maybe another bigger guitar amp?
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If you do that, you have to make sure the microphone is not pointing at the amp, otherwise it will feed back. In other words, the amp has to be in front of you pointing towards the audience, not behind you.
When you use a PA, you always set the speakers out in front pointing away from you for the same reason. There are also monitors pointing back towards you so you can hear yourself, but you have to be careful with the volume - otherwise - you guessed it - feedback!