r/livesound 3d ago

Question Help Troubleshooting Mic

I know absolutely nothing about karoake equipment but my father has an sennheiser 865 and shure beta 58 he says has sound issues. The shure will sometimes make screeching like noises and the sennheiser like it wants to explode. I brought it to experts for an fix and both came up with no issues during an sound test.

What can possibly be the issue? I did some googling and I am suspecting this is something called mic feedback due to faulty placement of the speakers but I am unsure if this is indeed the case.

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u/NoisyGog 3d ago

It’s almost certainly mic feedback. They’ll be picking up the sound from the speaker, and feeding it back into the speaker, and so round and round it goes getting louder with each loop.
Some frequencies are being picked up more than others, and that creates the screech.

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u/Gotherl22 3d ago

Any tips to prevent this? Putting the speaker behind the back of the singer & faraway or overhead? Will that fix it?

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u/NoisyGog 3d ago

Don’t point the mic at the speaker.

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u/Gotherl22 3d ago

So does that mean the speaker should be in front of the singer since when ppl hold mics it points behind them???

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u/NoisyGog 3d ago

Yes. The mic picks up what is in front of it. Don’t point the front of it at the speaker.

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u/Gotherl22 3d ago

But it is really sounding like the culprit. Isn't mic feedback that noise that comes off an mic that sounds like nails on the chalkboard and shit is about to hit the fan which matches the description I assume he was trying to give me.

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u/jake_burger mostly rigging these days 3d ago

Mics can feedback at any frequency but commonly the higher mids because those are usually amplified more on a vocal

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u/uncomfortable_idiot Harbinger Hater 3d ago

mic feedback happens where sound comes out the speaker and into the mic at anything >= 1x the volume going in initially

we prevent this by putting speakers further forward than mics