Custom Window Sound Blockers

Thanks for this. Very cool. Im on a very quiet street but the pane window behind my system is huge 8'8" x 6' 8", sonically a negative, especially with Open Baffle speakers. I have thought to apply fake brick panels, but preparing to sell, but I have Japanese screens breaking up a lot of the problem

For very large windows/sliding doors, there are sound blocking drapery that is used in hotels/motels that can absorb some of the sound.  Search Amazon for sound proof curtains.

@tweak1 these panels are insulating, but probably very reflective.

The curtains seem better for you