[quote name='BigRedX' post='1227226' date='May 11 2011, 10:15 AM']Are you hoping to be able to use a drum kit (and whole band) in there or is it going to be just for you to play bass in?
Bass frequencies are the problematic ones because they transmit through the structure of the building. You attenuate these by building a room completely inside the existing structure and physically isolated from it as much as possible. What you need is high mass for both the structures and isolation between them. You may find that by the time you've got enough soundproofing in there the volume of the resulting space will no longer be sufficient for a whole band.[/quote]Yeah, I know, my neighbours f***ing hate me, especially as I'm trying out dub bass lines for a new project.
Still, better than the Celion Dion that gets played next door.