diffuser


can this be used as a diffuser on the wall behind the speakers?
https://www.worldmarket.com/product/mosaic-wood-panel-with-shelves.do?sortby=ourPicks
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Yes it can and wood is the best material for diffusers. This will mostly diffuse upper and high frequencies - since it has a shallow depth, bandwidth will be narrow, but better than nothing...and cheap.
Call GIK Acoustics and ask them for help in selecting a product.  You may decide on something completely different to meet your needs.