I'm guessing the plywood will be less dense/more absorbent than drywall- but I don't know either. I do know to agree with Tom, and with Bridgman- both offer top notch advice.

I agree that the carpet will be different acousticaly- probably will absorb highs, but not as effective as panels for the midrange.

-Dave

M80s VP150 QS8s EP500s
ravenmanor.com/cinema/