Window Treatments to Remove reflected sound

No set blinds will have any effect below mid-frequencies and exactly where they will change from dispersing the audio to reflecting it is somewhat unpredictable. The glass is transparent to bass and reflective of HF so, in order to have a nearly equal effect across the spectrum, you need some heavy absorbtion from the low midrange up. I've used velvet drapes interlined with dacron acoustic batting. Since the coverage is adjustable, you can titrate the effect you want.

Kal

Thanks for the good input. What exactly do tuning dots do? There is no explanation of them on the web sit referenced.

Tuning dots, if they work like drum head dampers, reduce vibration and ring. Sort of like when you lightly touch a ringing wine glass. Depending on how softly or firmly you touch the glass, the ringing will be reduced or eliminated.

At least that's how I believe the tuning dots...or felt/rubber furniture protectors...would work.

A previous room had three large windows that were covered with "cellular blinds" and then the windows had heavy fabric over treatments. This proved to be very effective. You could even discern differences that resulted from opening the blinds differing amounts.

I agree with Dougmc. I have plastic 3 in. regular shutters on all windows. Turned at 45 deg., they provide good mid/high diffusion and light control to boot! Wood might work even better. (Lets, see... maple? (:-))