This video explains why egg cartons are not effective in an acoustic treatment aspect. The speaker breaks it down mathematically for an end-all to the constant question of "can I just put egg cartons on the walls?"
Pretty much. Egg cartons are decent high frequency diffusers, but they do fuck all for anything below about 1.5k. Foam does a decent job down to about 500, and below that you need much denser material (Owens-Corning 703 fiberglass insulation covered with burlap is generally a good broadband absorber and can definitely work for corner bass traps).
Last edited by oneblackened at Aug 12, 2014,
Yeah, blankets, egg cartons, foam, will suck out some of the highs, whihc are easy to hear problems with (flutter echo), but leave the low-mid and bass mud which is not so easy to hear.