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Old 1st November 2011, 03:14 PM   #1
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Default microphones on a home theater setup

I am in the home video market but have a school using a 5.1 home theater setup in a classroom for learning, etc. They want to add a wireless microphone. The microphone will be used for things like parent/teacher nights.
Without having to install a separate sound system how can I connect the mics to this system.
I know I need the wireless mic(s) and receiver. Someone told me I can then use a XLR to RCA adapter to connect to a left/right input of the A/V receiver. This doesn't sound right.
I was looking at the ShurePGX system which has a XLR and 1/4 output but I am thinking this adapter is the wrong way to introduce audio into the stereo receiver.
Can someone help?
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Old 2nd November 2011, 10:36 AM   #2
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The adaptor should work; oh, if the mic's coming out balanced it's going to prefer a balanced input, and if it's designed to run into a console mic input rather than a line you're going to be short of gain. But a number of manufacturers give unbalanced outputs, as well as (or, in the case of cheaper models, instead of) XLRs.
More worrying for me is the lack of an independent volume control; as you switch between mic and home theatre the level is going to change, perhaps massively. I'd build a box, big enough to put active electronics or a transformer in should it be needed but to start with just a volume potentiometer and sockets on the back. If you're thinking of more than one mic, several pots – if there isn't enough gain, a mixer circuit can be added.

Or, a tiny mixer can be bought cheaper than one of the radio mics, and probably look neater than anything you can easily build. It's not a bad thing to own, either; if you're recognised as a video specialist somebody's very likely to ask you to record a conference, or a wedding or bar mitzvah – a couple of radio mics and a micro mixer can outclass the fixed mic on a cheap camera any day.
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Old 2nd November 2011, 01:07 PM   #3
imix500 is offline imix500  United States
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The adapter is the easy part. Just about any wireless receiver has a robust enough line driver to handle being connected to an unbalanced input. (hot to hot, cold and gnd to gnd). Many are not discretely balanced anyway. (there are a few ways to create a balanced signal)

The bigger problem will be gain before feedback. Use of a headset style mic will be mandatory. The built in eq will almost certainly not be sufficient. The headset will give you a fighting chance.
Turn off the center and surround speakers and don't plan on using the sub for voice.
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