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I'm looking for a way to record a live dance class in a 25' x 20' space. I want the classroom ambience but also want the teacher's voice to be clear. I'll be using a PA system either in the back or front of the class. I'll be routing the output of the PA system directly into a computer and likely mixing that with a room mic to add the classroom ambience. Is there a suitable microphone that, if placed properly, will pickup a teacher at the front of the class as well as a robust room ambience? The teacher will be located between 3 and 10 feet from the microphone. The teacher will also face the microphone as I intend to mount this microphone on the wall towards the ceiling. I know I could mix a room mic with a fitness mic (something the teacher wears), but I'm wondering if there is a suitable mic that would remove the need for two mics.

In addition, this recording takes place in a dance studio in which almost all wall surface area is covered in mirrors. What considerations should I have regarding this environment when choosing a microphone?

Thanks for reading

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I've been avoiding answering this for the whole day, because my overwhelming thought is "you don't want to do it like that".
Ambience is going to be the enemy of clarity in that type of environment.

You're feeding a 'fitness mic' - which I assume is some kind of cheap headset mic near the mouth - into a PA in a very live room.
Any other mic you put in that room is going to be ambient - whether it's 3ft or 10ft from your instructor. You do not want to be feeding this mic to your PA at all.

The only solution I can see does involve both mics.

Your 'fitness mic' feeds to the PA & to your recording. Get the PA at the opposite end of the room from the instructor.
Your ambient mic feeds only to your recording. The further away from your instructor & the PA, the better. This is [attempting to be] purely for room sound, so you want to avoid the main voice as much as possible.
You judiciously balance one against the other using headphones before feeding it to your recorder, unless you are recording multi-track so you can mix later.

This will all need to be mono, else you will need two ambient mics.

As for mic choice; you may as well just go for a dynamic cardioid on a wall, pointing at the room centre.

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