I know this is a basic question, but am needing something effective for side wall and ceiling 1st reflections. Can get six 2' x 4' x 2" sheets online for $120 shipped. Sound good? I will cover and hang them.
Have nice 5.5" cotton corner traps (thanks Bryan) and homemade polys and skylines diffusers. I think the ceiling esp. is main cause of some shrillness at loud levels, not a surprise in this room (11.5'w x 26.5' long, hard plaster walls/ceiling and carpeted floor. Apartment built in 50's).
Thanks, Don