Ok I just finishing off my new studio build and about to get her up and running. I've floated the floors completly separated both studio and vocal booth! Problem is between the two sliding glass patio doors that connect from one to another which has about 8" of space between the two, I'm getting a nasty reverb in the middle of this area. I have isulated inbetween with 4" rock wool completly and even used a little 4" foam around the frame. It's seems to be the doors them self's, there kind of the drums when sound hits them! What can I do to lessen my problem :? :? ?