how can I make the back wall transparent?


If this is the wrong place for this topic please move it

My listening room is 11.5 x 15 and my speakers are 3.5 ft from the back wall.

I have spent considerable effort tweaking stuff, to the point where the system sounds very spacious and deep, BUT it still does not sound as spacious as systems with 6-8 ft of free space behind the speakers.

Is there any aesthetically pleasing wall treatment available that would give me that depth without moving the speakers

Taking the wall down is not an option:-)
williewonka
I like the hang on the rope idea. Easier to borrow some if you run out in the you know---. I should of guessed 'Charmin' because that is the way I want my system to sound. And by the way that little 'Charmin' doll should try out for American Idol I think. Good one Willie.
In the early 70's my band rented a house and nailed mattresses (back when you could get mattresses cheap at Goodwill) to plywood sheets on the basement walls and ceiling...possibly the ugliest good idea ever. (insert "Yo Mama" joke here).
there are still plenty of cheap brand new mattresses. they're not too good for your bed, but definitely great for acoustic traps.
if you're purchaseing used from Goodwill or from someone, you're under risk of bringing bed bugs to your home.
Those days are long gone, but no bug could survive the music we played back then. I do miss the ability to sleep on the ceiling.