echobusters.com and there are some brands at audioadvisor.com. If I were you i would do at this site just for treatment info:
http://www.geocities.com/jonrisch/index2.htm
FWIW - i made panels according to his plans, i they work really well. Good luck
http://www.geocities.com/jonrisch/index2.htm
FWIW - i made panels according to his plans, i they work really well. Good luck