Vinyl Blinds

Most banquet halls that have the the large acoustically baffled room dividers also have vinyl backed drapes to deaden the sound.

You can also get mass loaded vinyl for even better absorption

How Is Mass Loaded Vinyl Used in Soundproofing? | Acoustical Solutions

Soundproofing Curtains and Blankets (tmsoundproofing.com)

https://www.soundproofing.org/infopages/curtains.htm

Soundproofing a Band Rehearsal Space | Acoustical Solutions

Sports & Entertainment Venue Acoustics | Acoustical Surfaces

The list goes on :-)

I have tried the mass loaded vinyl with great effect - still have one piece backed with foam to allow it to vibrate - on top of a bookshelf - works like a charm

Regards - Steve

Vinyl is a hard surface, and for obvious reasons, the sound will 'bounce' off this surface, no matter how thick the Vinyl.  I would recommend a heavier cloth drapery effect for a couple of these windows, so you can realize a small amount of acoustic room treatment...

I’ve got a good amount of glass as well and went to the heavy fabric blinds as mentioned above. Works very well.

Thanks for the responses. I will probably be looking at curtains especially for the side of the room that has no furniture.

I'm sure they're better than the exposed glass of a window or even drywall. Adding curtains over them will help.

I’ve used them successfully in my old listening room - they actually absorb sound and turn it into tiny amounts of heat - they are very good at absorbing sound - they do not diffuse it

you should position them...

• close to the ceiling
• try different locations - behind the listener first, then sides
• only drop them down by about 2 feet from the ceiling
• they do nothing for bass related issues like standing waves

I’ve tried it in three locations and they work very well

1. my old room, 8ft ceiling - pulled it down about 15"
2. a friends 12 ft high concrete condo - we had them at the sides and behind the listener and dropped them 24"
3. a friends house - 9 ft ceiling - behind the listener - 24" drop

I used a regular blind at home, but used a heavier vinyl for the condo - lots of reflected sound

Where to get the heavier vinyl? - try those companies that print large vinyl signs

The best "diffusers" are those panels you see with lots of different sized pieces of wood

Sound absorbers should be used very carefully - too many will deaden the room - I actually took all of mine out once I get the vinyl hung. If anything, use carpet on the floor and canvas pictures on the side wall 


Hope that helps - Steve

They make thick woven fabric vertical blinds. I used them for a stock broker's new offices to solve acoustics at the glass perimeter: angled half way closed avoided sound reflections and caught reflected sound from behind yet maintained a sideways view of St. Patrick's Cathedral, etc. They worked quite well.

Their prior location, across the street, black metal horizontal blinds, fully closed, looked like the black hole of Calcutta (whatever that is), might as well have been in a basement.

Never heard of common cheap window blinds utilized as cheap substitutes having any positive impact as diffusers.

With reference to the following link - as just one sampler among the many - explaining the science and “do’s and don’ts of treating first reflections, and their educational breakdown the fundamentals of diffusion by outlining the different types of diffusion .... I doubt it.

https://www.gikacoustics.com/treating-first-reflections/