ok im opening pandoras box here.(treatment vs framed wall art)

See if you have slap echo
chap your hands sharply and listen for tinny echo

I find corner treatment placements work best
Real Traps and GIK are great sources

back wall absorbtion

GIK does art panels with professional photographs via sites like photostock or your own higher rez image. I have 3 nice pieces

i also use stretched cloth / canvas artwork - works nice, just enough absorption. You can hang a lot of art with neutral sound influence
art.com has thousands of great works

too much sound treatment and your system can sound like mud.



All the best in your journey

Just remember that diffusion is just as important as absorption, sometimes even more so.

Buy Jim Smith's book "Get Better Sound"!

Thanks for all the input
     As i stated earlier i am getting my audio room under control (new house) .My Ht room is big and has alot of slap echo to deal with.Which is back burnered right now ,i'm living with it .But my original post was regarding some of the mega systems here on the gon virtual.I see some serious setups and wonder how the hell does he have 20 framed glass pics on his walls??? How is he/she   battling the resonation that has to be taking place .

To David Pritchard. Please clarify what a "transducer" is--and how do those items you mention transduce? Thanks.