Window plugging?

Hey guys, I check up on these forums quite often to see everyone's studio ideas and stuff and I'm enjoying the knowledge I'm collecting :) I have a question about sealing up 2 windows in my bedroom to at least prevent some of the sound from escaping. It's a splitlevel, so about halfway up the wall is underground. I'm pretty sure plugging up the window would help quite a bit with the sound transmissions outside (especially due to the fact that the windows suck and hardly seal.) I'll hopefully be getting new ones this summer, that should help too I would assume. Anyone have some designs for some cheap window plug type things that could be removed for safety reasons? I was thinking something like a 4'x5' sheet of plywood with something attached to the window side of the wood (this material is my main concern, I want cheap but effective, who doesnt! :)) and having some sort of rubber seal to the wall. Any help is very appreciated! By the way, I'm in the flooring business so I have a lot of access to different carpets, carpet pad, wood floor sound transmission pad. (It's like a very dense/heavy gray padding about 1/4", you put it under floating wood floors to prevent sound on floors below, I'm not sure if this would work well if I stacked like 6 layers on or something :)) Lookin to spend like 150 bucks (mainly for this material that I should use to prevent the sound transmission, I know it won't be perfect but at least something to try to keep my neighbors sane!), I already have plywood if that could be used. Thanks all! :D

did you see this yet? :) http://www.johnlsayers.com/phpBB2/viewt ... =1375#1375

Hey man, thanks a lot for that reference. I'll check into making that.. I'm not too sure that my window is 6" deep into the wall though, would that thing still work if I used a little less insulation?

That is 6" nominal insulation, compressed into the space available. Also, been meaning to update that drawing - you should use at least one more layer of MDF for the left side mass, and NONE next to the glass; the glass itself will be one mass in the mass-air-mass equation... Steve

Gotcha, thanks guys :D