Members Art Flood Posted July 1, 2013 Members Share Posted July 1, 2013 I had a couple of unusual feedback issues at recent gigs.First one was a vocal mic being used by the MC. Soft but audible high pitched squeals when the MC made announcements standing about three feet directly behind the front of house speakers (PRX612 over PRX618xlf). I had to move him back and to the side to stop it. Is this odd?The second one, was an intermittent high pitched squeal from an acoustic guitar. This was from a guitar that I use a lot and have had no trouble with. Very moderate foldback and FOH volume. On this this occasion I was using a wireless system instead of a cable. I am starting to suspect this had something to do with the wireless. Is this possible? Link to comment Share on other sites More sharing options...
Members WynnD Posted July 1, 2013 Members Share Posted July 1, 2013 I don't buy any of that. Place a microphone in front of the FOH speakers and if you don't get feedback, it should be a surprise. Acoustic guitars are such common feedback sources that most have their sound hole plugged up. (It's also the reason that solid body guitars came into being.) You're probably running the PA system at higher volumes than you used to and are just not aware of it. Link to comment Share on other sites More sharing options...
Members agedhorse Posted July 1, 2013 Members Share Posted July 1, 2013 Most acoustics have their holes filled in? Really? I don't think I have see this once in the last 100 gigs I've done w/ acoustics. Link to comment Share on other sites More sharing options...
Members mkfs9 Posted July 1, 2013 Members Share Posted July 1, 2013 I assume it was a monitor feeding back. I tend to take out the monitor when guests are speaking as they tend to talk louder into the mic when they can't hear themselves Link to comment Share on other sites More sharing options...
Members Pro Sound Guy Posted July 1, 2013 Members Share Posted July 1, 2013 Stuff the guitar with fiberglass Ok..im kidding Link to comment Share on other sites More sharing options...
Members Pro Sound Guy Posted July 2, 2013 Members Share Posted July 2, 2013 Were there any other mics in the system besides the MC vox, and the guitar ?I have had and issue where the wrong mic was hot in a system on stage and was mistaken foranother mic/channel and the gain was WAY up on that micOne of those WTF is that feedback coming from?It does happen.One of the stage monitors on stage way to hot?Take your time and do it again and youll figure it out. Link to comment Share on other sites More sharing options...
Members Art Flood Posted July 2, 2013 Author Members Share Posted July 2, 2013 Hi Pro Sound Guy,The guitar squeal happened during a gig - there was only 1 vocal mic and the guitar open at that stage.The MC's microphone was feeding back during sound check so I could isolate it to just the one mic. I think its a quirk with my PRX612m speakers - seems to be a HF hot spot right behing the speaker. Will play around with this some more next chance I get. I never really had anyone standing right behind the speaker before - but that's definately where it happens - odd thing is you can pretty walk in front of the speaker without a squeal.Cheers Link to comment Share on other sites More sharing options...
Members dboomer Posted July 2, 2013 Members Share Posted July 2, 2013 If you are comparing a wired mic to a wireless mic in terms of feedback ... Well first you do have two different mics so there could be differences because the pattern and the frequency response of those two specific mics. Additionally if the wireless mic is an analog unit I would expect a few dB difference in GBF as analog systems are almost always under a few dB of compression during actual use. This should not be the case when using digital wireless mics. Link to comment Share on other sites More sharing options...
Members Art Flood Posted July 2, 2013 Author Members Share Posted July 2, 2013 dboomer wrote: If you are comparing a wired mic to a wireless mic in terms of feedback ... Well first you do have two different mics so there could be differences because the pattern and the frequency response of those two specific mics. Additionally if the wireless mic is an analog unit I would expect a few dB difference in GBF as analog systems are almost always under a few dB of compression during actual use. This should not be the case when using digital wireless mics. Thanks Don,In this case it has more to do with comparing a wireless guitar system to a wired guitar. I've justed started using a Line 6 Relay system for the acoustic guitar. I think I have solved the occasional feedback problem by just rolling off a bit more of the highs than when using a cable. (Doh!)Seems the Line 6 does work better than a cable!Cheers Link to comment Share on other sites More sharing options...
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