Help in soundproofing unusual setup

I searched through the forums for soundproofing threads and found
several. But, I didn't come across any that addressed my specific
situation. I read a lot about sound channels, green glue, quiet rock,
insulation, etc, but am not sure which of these techniques or combinations
will work the best for my situation.

I am converting an existing room into a home theater. The room currently
has a vaulted ceiling. The room is in the corner of the house. Two walls are
to the exterior of the house, one wall is to a laundry room and garage. I am
not concerned about soundproofing these three walls.

Walls in home theater room:

+-------------Exterior Wall-----------------+
|................................................. ..........|
|................................................. ..........|
|................................................. ..........|
|................................................. ..........|
Wall.............................................. ..........|
Shared w/ Mbdrm .................................Exterior
|................................................. .......Wall
|................................................. ..........|
|................................................. ..........|
|................................................. ..........|
+------------------------------------------+
Garage....................Laundry Room

The wall shared with the master bdrm is my concern. A cross-section of
this wall is shown below. Behind the upper portion of this wall is our master
bedroom. This fourth wall is drywall on either side of the studs, and
also filled with sprayed-in insulation. A ceiling will be installed in this room at
a height of 8'. So, the upper portion of the wall that is adjacent to the
master bedroom will not be visible from the home theater room, and sound to
it should (I hope) be somewhat blocked by the 8' ceiling.

Cross-section of Wall Shared w/ Mbdrm:


|\
|...\
|.....\
|........\
|...........\ <--- Upper portion which is adjacent to master bedroom
|..............\
|.................\
|--------------\ <--- New ceiling to be installed in the home theater
|.....................|
|.....................| <--- Home theater
|.....................|
|---------------|


What options do I have for minimizing sound from the home theater into our
master bedroom? I prefer not to remove the existing drywall
on the wall shared with the master bedroom. And, of course, the more
soundproofing I can achieve with my money, the better.

Thanks,

Jai

Re: Help in soundproofing unusual setup

Chuck,

Exactly -- I only need to soundproof the upper part of the wall since a
bedroom exists behind the upper part. I'm not worried about the lower
section.

Based on your reply and after some phone conversations, I've decided to
add two layers of 5/8" thick drywall to the upper part of the wall with
green glue between the original drywall and the first new layer, as well as
green glue between the first new layer and second new layer. I recall
reading somewhere on this forum that I may be better off with using
one layer of 5/8" and the second layer of 1/2" drywall. Is this true?

I will probably stick with one layer of drywall on the new ceiling, but will
insulate the ceiling (both for noise reduction and to keep the heat in
the room).

Thanks to everyone for the advice.