Good Materials for Curtains

These curtains are meant to block outside noise more than provide a sound treatment for a room. Probably will do both, however.

I've never needed to use ... but if I did, I would try the "Block out" curtains. They are for blocking out the light... and so they have a rubber backing. I think that would do wonders over just  fabric alone.

Vinyl is very good for sound absorption - I have used a vinyl roller blind behind the listening position and in front of a window with great success.

The blind only had to be extended about 18-24 inches for optimum  benefit/effect.

I have also tried a strip of vinyl 8 ft x 2ft in an open plan concrete condo again at ceiling height (12ft high) behind the listening position and at one side between the open plan kitchen and the listening area.

My new basement listening room has several dropped portions of ceiling to accommodate heating ducts, which seems to trap unwanted reflections at ceiling height. The room is also irregularly shaped, which also helps a lot

I have seen a couple of acoustic specialists which incorporate vinyl into their products

It would appear that the vinyl does not have to be very thick, which helps with the weight problem

Hope That helps - Steve