[nodiak]

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

[Red Dragon Audio]

Those will work great for 1st reflection points on the walls and ceiling.   

[rajacat]

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

These rockwool boards should work just as well and are considerably cheaper.

-Roy
http://www.atsacoustics.com/item--Roxul-Rockboard-60-Case-of-6--RB60.html

[bpape]

You can get the 703 considerably cheaper.  The mineral wool will certainly work fine acoustically.  For a DIY project, I personally don't like to work with it.  I much prefer the 703.  It cuts much easier and cleaner without any worries of crumbling.

Bryan

[nodiak]

Thanks everyone. Just ordered the 6 pack of 6lb Rockwool rajacat linked to. $93 with shipping, saved a couple pizzas over the 703.
Don