rigid fiberglass covered with material. Looks good and is much more absorbent than foam.
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I assume you're walking around the room, clapping you hands and hearing it? Try a tapestry, or a quilt in the location. I use the ASC wallboards..about $50 each...but the look good.
Maybe also a shelf (or several wall sconces) with some odd shaped objects...anything to break up the refections...mine was high up...like 6-8ft where the furnature wasn't killing the bad vibes....
Bosch, are you the one who posted about doing a diagonal room setup? I am, too and for the slap (flutter) echo I purchased two sets of Golden Sound Acoustic Discs. It was either those or buying/making triangular pillows. Having heard the DIY room lenses in action, I decided to go for the Acoustic Discs, as they work similar in principle--diffracting sound waves.
Best in your project, and keep us posted. You can send me a private e-mail if you wish.
i have 1.6 maggies and they are dipolar;i recently bought 2 fake ficus trees and put them behind each speaker.they diffused the sound and killed the slap echo.the sound wasn't deadened and the soundstage remained.
use of absorption material can have an adverse effect on the sound,so use it sparingly.
in your case ,you could use them accross from the speakers on the far wall.the cost is only about 40$ a piece.