Acoustic Curtain for listening area

Prepping a room is no small expense.  I haven't seen any spectral absorption curves on any of these sites.  That is what it's all about isn't it?  Curtains face a tough challenge for room effects midbass and below.  Solid panels need to be suspended from the wall about 4".  Manufacturers supply acoustic studies, but oddly this most important parameter has not been addressed.  No secrets or snake oil here.  Review Armstrong's products and Acoustimac Eco-core particularly before anyone else takes the plunge. 

The best room treatment, in my opinion, is to treat a room as a room that you live in.-Bookshelves, Art on the walls, Window treatments, etc..

In other words, lots of stuff. That creates multiple/random points for sound waves to disperse/absorb within a room.

You can get anal about making a room sonically 'flat', but that is usually the worst thing you can do.

Just put up a blanket where you think you need some absorbtion, and listen.

The time you take to learn how seemingly simple adjustments to your listening area, will help you learn what you like/dislike.

YMMV

Bob

was about to pull the trigger on these panels in link (I like the look)...so strange , multiple sellers from Ukraine, the shipping is fierce and one seller had "Free shipping" but he marked up the panels so high it equaled the exorbitant shipping , I give up 😒....I think it’s all the same guy trying to lure posing as different sellers

You might be able to stop higher frequencies this way but not anything below 250 Hz. It would have to be very heavy light blocking and layered. Your best bet is to have them custom made. If you go to your local fabric store to pick out your fabric they will have a list of seamstresses they recommend. You can get ceiling tracks from a number of sources.  

I use the black out curtains in my listening room. I have them behind the speakers. Listening chair and side walls.