isolation booth doors

[garbagelarge]

hi - i am renting a space that was built to be a studio. it has a big live room and two isolation booths. we turned one of the booths into a control room. the first acoustical problem that we have encountered is that the booths are not soundproofed - hardley at all. they were poorley designed and i think a lot of the leakage comes from the doors which were constructed of 1/8 plywood on either side of about 4 inches of styraphome. i want to put new doors in and i am looking for a design....
any input or directions to another post(i did search and read some very helpful things) or website would be great -
thank you - ben

[studiomaster]

Design don't matter. Make sure you use a heavy door so it can eliminate any vibrations going in or out of the booth. Also, dampen the door from the booth side with 703 perhaps.

[garbagelarge]

because the door has to be so thick(4 inches or so) to fit where old one was, i was thinking of having 2 thick sheets of ply-wood with a cavity in the center(created by using 4 2 x 2's at the edges, in between the sheets) stuffed with some type of insulation - will this work and if so what type of insulation should i use?
thanks, ben

[garbagelarge]

would i be better off just using solid plywood (it would have to be several sheets screwed together) with absorbtion on the booth side? - thanks

[pandamonk]

Originally Posted by garbagelarge

would i be better off just using solid plywood (it would have to be several sheets screwed together) with absorbtion on the booth side? - thanks

Have you considered MDF? It's probably a lot denser so should isolate better.