Originally Posted by williamn333
- How do I handle the window since it is arched? I would like to block light.
Depends on how much light you want to block. You could get pretty good (not perfect) light control with blackout curtains hung over the entire window. Because curtains are never tight to the wall, you will get some light spill from around the edges of the curtains. If you want more complete light control on this window, you will need to make a plug for the window. A window plug is a piece of plywood (or MDF or whatever) cut to fit snugly in the window opening. You screw cleats to the sides of the window opening and screw the plug to the cleats. If you apply black paint to the side of the plug facing the window, from outside the house it will look pretty much like a dark room.
•Also with the window, would I need any sort of sound absortion over it?
That would be a good idea, I think. From your sketchup model, it looks like the window might fall at a first reflection point for your front speakers. Thick, heavy curtains over the window would help. If you plug the window, you can treat the inside face of the plug with linnacoustic and cover it with fabric.
•As far as sound proofing the entire room, what would be my options for this?
For general information on soundproofing, there is excellent information available here: http://www.soundproofingcompany.com/soundproofing101/
The best thing you could do for soundproofing would be to ditch the french doors. A much better option for soundproofing would be a heavy, 1-3/4" solid core slab exterior door with good weatherstripping and a drop-down bottom seal.
For the new walls you're having built, put some R13 fiberglass insulation in the stud cavities.
Otherwise, soundproofing an existing room is difficult, at best. You can add a second layer of 5/8" drywall to the entire room (including the ceiling), with Green Glue between the layers. Caulk the gap between the floor and the bottom of the drywall with acoustic sealant. Seal the electrical outlets as well as possible.
Since this room has vaulted ceilings and the three walls I show on here are exterior walls, how can I run speaker wire on that front wall and the back wall?
It is possible to fish wires through exterior walls but it is certainly not easy. Possible alternatives: (1) carefully cut a strip out of the drywall, run your wires and patch the drywall. Sounds ugly, I know, but if no. 2 won't work, this is usually the easiest, fastest and most effective. (2) Remove the baseboards and you will probably see a gap between the floor and the bottom of the drywall. You can tuck the wires into that gap and then re-install the baseboards. Works fine until you get to a doorway, and assuming you don't put a nail through the wires when you're reinstalling the baseboard. (3) If you put up crown moulding, you can use the triangular space behind the moulding as a wire chase.