there have been a LOT of posts here on the topic.
do a search here at gs.
here's one from this last week.
Room treatments 'Art and Science'
check out
www.realtraps.com
and
www.readytraps.com
joel, at ready traps is SUPER helpful.
you can download the full range frequency tone generators, or make your own,
and use the various measuring charts available at some of the above websites, and elsewhere.
then, get some 703, and wrap it. it WILL work wonders.
good luck, and keep us posted.