had a bad echo in my listening room so a couple minutes ago i made 4 room treatments from r13 insulation and garbage bags-
i had half a roll of paper back r13 in the garage so i cut pices the same size as some real cheap 13 gallon garbage bags(the kind that rip when you take them out of the can)i dont use.
thumb tacked them on the walls at the ceilings and

not a match for my 8th nerve corners looks wise