Some member-contributed DIY projects -
Acoustic panels... a photo essay...
http://www.johnlsayers.com/phpBB2/viewtopic.php?t=4581
DIY Gobo design (with diagram)
http://www.johnlsayers.com/phpBB2/viewtopic.php?t=5928
DIY corner broadband trap, originally posted on RO
http://www.cloneensemble.com/basstraps.htm
Kendale's Kompletely Kool Kloud Project (cloud, for the search function)
http://www.johnlsayers.com/phpBB2/viewtopic.php?t=4091
David French's Easy DIY Cloud, from RO
http://www.recording.org/ftopict-26889.html
How I built my bass traps (superchunk method) - John Shryock
http://www.johnlsayers.com/phpBB2/viewtopic.php?t=7278
Another Bass Trap DIY - Scott Girvan
http://www.johnlsayers.com/phpBB2/viewtopic.php?t=7293
DIY Acoustic Treatments
Originally posted at johnlsayers.com, topic 5930.