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Ok I have currently been using 2-jbl eon 15's for more high end and a 18" peavey sub for the low end. Iam running music through my computer using winamp and a plugin for karaoke zip files. I also have two extra speakers that I plan to use as a back up plan if I loose either the peavey or the jbl's. My extra speakers are about 4 feet tall trapezoid shape. They both have a 18" sub a small mid size speaker and a plastic horn for the high end. I decided to try all speakers together this past weekend and the only way I could use the mics in front of my setup was to turn off the speakers that I recently incorporated. I get some major feed back from them. I tried to turn them away from the singers as best I could but  I also didn't want to take the sound away from the crowd. The extra speakers scream and I would like to continue using them all the time but I don't want to have to remember to turn them up and turn them down all the time because it is embarrassing that one time you forget and get that awful bass feedback through the speakers. I know with all the skillful folks that will read this I will soon have a remedy.

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The first thing is the speakers should be in front of the microphone facing out and away from the singer.  You should have a speaker on the ground on an angle facing up at the singer for a monitor so they can hear themselves.

Well, my experience says that the better balance in sound you have the less feedback you get. If you get high frequency feedback (whistling) it means that you have too much treble in the mic and/or music. Then again the low frequency feedback (loud, growing humming) is a sign of too much bass in the mic channel and/or music channel. So, you should try to find the correct balance and actually feedback is quite a good guide for that. Once you have your balance, you can have the mic really near to the speakers (1-2 feet even) and it won't start giving feedback.

The quick cure tho is to advise singers not to take position in front of (or under) a speaker directed right at their back (or occiput).

Restaurants with a lot of hard wall, floor and ceiling materials will always be more sensitive for feedback than ones with a lot of soft materials (couches, carpets, panels etc). So one way to limit feedback is also to make the surroundings more absorbing.

Cheers,
jee

The Jbl's have a high front to back ratio whereas they dont have a lot of sound coming from the back.  It sounds like the trapezoids have too much sound to the rear. If it is a permanent gig you can build movable baffles to put behind them.  Also if the wall behind the singers is hard and reflective and they are close to the wall you tend to get feedback.

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Feedback is really a simple thing to comprehend. When MICROPHONE amplification re-enters the MICROPHONE, feedback occurs. This is not the only example of feedback, but in looking at your question, it is most likely the feedback problem you are experiencing.

The microphone can have something to say about this. If your microphone has a "cardioid" rejection pattern, then it can help reduce the feedback from nearby speakers that carry the amplified microphones signal. Therefore, the microphones you are using have a great deal to do with the tollerance of your setup's feedback.

If you are recieveing this microphone feedback there is only a couple of things you can do. Change the placement and arrangement of your speakers so that they do not sound back into the microphone. Also, become educated as to the signal rejection capabilities of your current microphone. I have seen situations in which simply changing microphones solved feedback problems.[/code]

There are many things to try if you have feedback.

1 Speaker placement is key try and have your singers 10ft + away from your speakers.

2 Place you self / singers equal distant away from speakers.

3 If room permits try different speaker set ups place your speakers on the far side of the room.

4 More expensive mics will produce less feed back.

5 Look into a dbx drive rack this will also help feedback issues.