Ethan Winer explains it in detail in Part 4 of his book, The Audio Expert. Well worth the read before haphazardly throwing stuff on the walls. His realtraps.com site also has some good starter articles on the subject.
Room Treaments - Where To Begin...
Hi All: I have read countless comments that the best thing you can do to improve the listening experience is to acoustically treat the room. But where does one gain the expertise to do so? There are so many products/options out there. I have no clue where to begin (or if I even need to do it)... Thanks!