I need to increase isolation in a room I record in, that is, to prevent sound from coming in. There isn't a whole lot of sound to isolate, but enough to drive me crazy when doing critical recordings.
The room is an upstairs bedroom 15' X 8'. Most of the sound comes from the 2 walls which are the outer walls of the house.
The room also has a window which I already treated with a self made window plug made from high density rubber I bought here:
http://www.soundproofwindows.com/
It does an OK job...
I have an idea for a non-permanent solution and need some advice as to whether I will get good results.
My idea is to build a 'portable' double wall along the outer walls.
I thought of building airtight boxes out of 8X4 plywood or drywall and stack them next to each other to construct the double wall.
The boxes will be made from either plywood or drywall, and 2X6s on the sides to close them off. I would then use caulk to make the boxes airtight.
To add extra isolation I thought of attaching soundboard to the side of the boxes that faces the original wall, and attaching acoustic foam to the side that faces in the room.
When stacking each box next to each other I thought of attaching acoustic rubber underneath the box an above it to allow a snug fit with the ceiling, and apply acoustic tape between each box to seal off any air gaps between each box.
So here are my questions...
1. Do you think this design is any good?
2. Should I use plywood or dry wall to construct the boxes from?
3. Should I use any other materials instead of soundboard and foam?
Any other suggestion would be great!