Two of the walls in my bedroom are exterior brick walls. Unfortunately, the other two are dry walls, which are absolutely terrible for letting sound through. These are the two I want to insulate. I've checked the other thread 'Sound Proofing My Semi', and there were some interesting links in there. But I wasn't sure if what was advertised would be suitable for my room. Basically, my room isn't THAT big, and I'd rather not have something that consumed too much space into my listening room. My budget is around £1500, but obviously if I can spend less I will. All suggestions welcome. TIA Dimmy  I forgot to mention, I don't particularly care if sound gets out of the room, I just don't want sound to get in from outside the room.