Hi Matt,

I donÂt have any experience with that system, but I am an owner of an 8 zone/4 source Matrix system. I have used PSB ceiling speakers in my home (retail in Canada, about $200+ each) Some zones I have 4 speakers, in one other I have used only 2 speakers.

Here are some ramblings:

Key pads are a must have;
the Pronto remote is only one of others that may work your system (check out Harmony remotes as well);
I am a bit of an audiophile, so I wouldnÂt use ceiling speakers for critical stereo listening in your theatre room, nor would I use ceiling speakers in the theatre room for surround sound effect; ceiling speakers (imo) are a bit too light for good bass effect as well in your theatre room.
I donÂt missed the bass in the rest of the house so much;
Systems that can draw on more than one source at the same time is great as well.
If you have black/brown outs, get a surge protector.
Consider a media computer to install within your system;

I donÂt quite have 18" of room between floors, but this is the set up that I have:
Pink insulation between the floor joists;
Air space, about 6";
Then where I have a dropped ceiling , I have more pink (2") on top of the acoustic tiles.
This seems to be good sound insulation. The only trouble spot is above the excersise room which is not a dropped ceiling. This is under our walk-in closet, and it seems to rattle quite a bit. This room is drywall ceiling and is screwed right to the floor joists, so the transfer of sound is unfortunately quite good.

Hope this helps you out.