Acoustic Curtain for listening area

You could consider using thick fabric vertical blinds. You can angle the fabric faces to absorb/prevent reflections, still see thru at an angle when partially swivelled open, and partially draw them open to pass between rooms if needed.

Or, sliding panels rather than many small pivoting vanes

they have velvets under wools and blends

many vertical blind companies exist, just the 1st one that popped up.

I'm confused. I assume you have a 'wall' (read reflective) on the right side of your audio room and yet want a "heavy non reflective" curtain on the left. 

Seems like a mismatch?

Quietcurtains, See below:

Mike

@david_ten yes , not ideal listening situation , but it’s all I’ve got as of now....right side is a wall (which I might treat as well... left opens up into big living room / dining room (reflective)....was thinking close me into a sound listening box to kill reflection...

also been looking at black moving/sound blankets

thanks

Years ago, I bought heavy black velvet finish curtains from a theatrical supply house-I think they were even fire retardant. These were not marketed as acoustic material so the tariff was far less. Don't know if the OP is in a city that has a supply house like this- often, theatrical stuff is sold in the reuse market as well. 

Worked great for my needs at the time-- I wanted to black out a large room for use as a home theatre. Looked good too!