well said you answered all my questions. And my right center and left speaker do face my wall and my door. Do you think im better of doing it the way this member did his own acoustic panels
http://www.haoleb.com/acousticpanels.htm
he says its absorbs sound in the 100hz frequencies..pretty good
..so if I do make homemade panels I should try to pack a lot of thick insulation as possible in my frame right?
First of all, I can just about guarantee that the burlap will pull off of the wood, or has already. Second, the ability of a material to absorb, dampen, reflect or diffuse sound is directly dependent on its surface area. There are many ways to treat a room for different frequencies and one of the biggest factors that will determine how you do this is your budget. If you really want to keep the sound from going to other parts of the house, the best way it the "room inside a room", as was mentioned. That's expensive and it'll also require a door from the listening room to the outside world, with weatherstripping and its own HVAC ducting. BTW- the ducting would need to be isolated from the HVAC for the rest of the house and this adds to the expense.
There two main ways to transfer sound are airborne and structure-borne and they should be self-explanatory. If you build a room in a room, it minimizes both. If you can't realistically do that, minimizing the structure-borne transmission will help a lot. Nobody likes to be on one end of a house and having the floor or walls thumping in time to the music. Being in an adjacent room is even worse because it will have some of the airborne sound, too. If your door is hollow-core, it's not doing much more than acting like a drum head. Your walls are doing the same thing. Adding a layer of drywall will help. If you can, put a layer of particle board
and a layer of drywall over the existing drywall, or even better- put a layer of insulation on the existing wall, build another wall and mount it away from the original wall, with drywall on the back, insulation between the studs, and the particle board/drywall surface. Install a solid core door with weatherstrips all around, including the bottom. Keep the new wall and door physically separate from the original wall and door. This will help a lot, but if you make a cover for the supply and return air, you'll keep even more from getting to the rest of the house. Unfortunately, you'll be getting hotter or colder because of this. De-coupling your speakers from the floor will help.
