Minimum room size for Wilson Sophia II

I'm looking for help resolving an issue where music can be heard outside my house with doors/windows closed. The the speakers are in front of a sliding glass door (covered w/moving blankets).

One, possibly two ideas to resolve this:
1) Place sound blocking acoustical material in front of the glass w/ dead-space between layers.
2) Move speakers into a smaller room: 11.6' long (140") X 10.5' wide (126").

From your experience, is the second room is too small?

What removable materials could I put against the glass slider that would drastically reduce the sound?

System (106 db):
Wilson Sophia II
McIntosh MC501 500W monoblocks
McIntosh C500 tube preamp
Audio Research DAC7
Fully balanced system w/Transparent Super cables
they'll be fine in that room if set up properly and possibly if you do a little bit of room treatment. The size itself is not the issue - It will be a nearfield experience, but that also helps eliminate room reflections and sounds
My S3s are in 12'x 18' room with a draped sliding glass door behind the speakers and they work fine. The key is getting the WASP done correctly.

Primare_cd31,are your S3s still on the casters?
Yes they are still on casters as I still need to work on the room acoustic treatments. Speaker placement may need to change once treaments have been applied. Do the S4's sound much better on spike?
Being in a room of 16' x 14.4' x 7.84'. There several acoustic chalenges. I've had an acoustic engineer measured the room and the result wasn't very positive! Basically, i need to tune below 70hz region then from 148hz upward. I'll need to apply room specific tunable Helmholtz Resonators with rear ports, BAD ARC panels and RPG Skyline!
Primare_cd31, yes the S3s sound better when they're spiked and leveled, especially in the bass region.

I'd recommend having your dealer do the WASP, and remeasure
the room before you invest in a lot of room treatments.

I just had my room modified and a different Wilson dealer set-up my speaker using the WASP method and they sound great. Off axis they don't sound as good, but in the sweet spot they are incredible.