I am a sound engineer at the Capitol theatre. We have recently acquired 8 of your UHF wireless lavalier mics. Their uses range from lecture speakers to plays. We are currently running into problems with volume output and feedback. They sound great at a low level, but as you know, not everyone knows how to project well enough to compensate for low volume. While trying to boost the volume we are having extreme feedback problems at multiple freqs. Wondering if anyone had any suggestions on how to get the gain without the Feedback? What is the best way to attach a lavalier microphone to a person. Distance from mouth,body placement, direction of the mic itself (towards or away from the body....etc...
Gain before feedback is not directly related to the mics being wired or wireless. Please read the following to better understand the underlying causes of feedback and possible solutions: Basics of Equalization and Feedback
95% of theater mics are omnidirectional as they are the smallest and they can be placed in any orientation. The closer the mic is to the mouth, the more gain before feedback. Except don't place it directly under the chin as the chin blocks high frequency sounds from the mouth.
Most theaters place the mic in the hair; directly above the nose. Some place the mic in front of the ear with the cable draped over the ear. Some place the mic on the cheek and hold it various make-up sticky wax. Some simply use a small headworn mic.experiment! Also, check the web for theater bulletin boards that discuss technical matters.
Also, see this link: http://hyperphysics.phy-astr.gsu.edu/hbase/audio/pagi.html#c1