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
joelz

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