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Cd vs. microphone

In our church an installer placed 36-8 inch 8ohm 100watt ceiling speakers in the sanctuary. also placing one in the extra rooms... bathrooms, cry rooms, etc.etc. we currently have a heath and allen board... amps and eq's. on the monitors and a seperate amp and eq for the ceiling. We also have controlled peaking on the main microphones, with volume control knobs per set of two speakers. My question... we can blast a cd till its a uncomfortable noise, but the microphones seem only to reach half the volume before they distort the speakers... what to do?

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A few possibilites.

1. Even though you have some kind of peak limiting on your mics, the signal might still be peaking somewhere along the audio path and causing distortion. Gain controls might be set too high somewhere along the way.

2. The amp you are using might simply be driving too much power for the speakers to handle.

3. A faulty connection, connector, wire or input could cause distortion of something like distortion which is of course would be more apparent at higher volumes.

4. Equipment placement could be picking up sounds or interference from other sources.

5. If you are able to discern level peaks but they are occasional and not flat out, then a compressor placed in the mic signal path could certainly help - otherwise see # 1 above.

Best of luck in solving this.

Cheers.

bd.

Posted on Oct 29, 2008

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I do not know if an overhead microphone will work satisfactory for your application, unless you have several of them placed in the ceiling or it is a small room. You can use a boom with a shotgun microphone to direct it over the speaker. You may want to consider a parabolic microphone which is highly directional gathering sound from the direction it is pointed in. You may have to have an individual point the microphone at the speaker, and it known to have a poor low frequency response. You can look at the diagram from the below link and try to experiment with a cooking wok to see how it works.

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