Sound proofing a room

egg cartons ... no good for soundproofing ...
they have marginal acoustic absorption properties but are incomplete in the frequencies they absorb, so they actually do more harm than good. It's possible that they may diffuse some sound, but my opinion is that egg cartons are too flimsy to do that effectively.

check out this site for some good info on soundproofing as well as acoustic control:
http://www.saecollege.de/reference_material/index.html

also, check out the Studio Building and Display forum here for even more info
https://homerecording.com/bbs/forumdisplay.php?s=&forumid=20

Good Luck!
 
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