Windows in a listening room


My 12.5' x 15' listening room has an 8'-wide patio door on the long side. I was concerned that the large glass area might be hurting sound quality, and even got an estimate on a sound-absorbing curtain—about $600. Then I watch this video1, and now I don't worry about it any more.

http://www.acousticsinsider.com/window-behind-speakers-causing-problems/?utm_source=Acoustics+Inside...

Thought others might find it interesting.
john_g
All of the VTS dots are constrained layer dampers.

Confucius say only good vibration dead vibration.
not exactly sure what you mean. What I meant was the walls and glass windows act like drum heads so they should be somehow quieted.

I was wondering if playing at lower / reasonable volumes lessens the need for "quieting" those drum heads? As a solution?
90dB peaks. 70-75 dB average. (for my needs) This would be at the higher end of day to day volume for me. For example, I’m currently listening to Indian Classical at an average of low 60 dBs with peaks in the mid 70s. These are measured at the listening position.