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They made a big difference when I was running dipoles in the room (small Magnepans) I was even using an inverted QRD (basically the packing "opposite" that came with the SRL diffusers) in the center front wall, which also helped. They really helped tame the backwave of the speakers from over powering the small room. Comb filtering and such.With the KEFs, they still seem to add a bit of depth to the sound stage. The center mounted unit didn't add much, so using an absorber there now.
Thank you for your input, I just got a pair of GR Research Super V's finished which are dipoles. You're the second person that I have read that said diffusers make a big different with dipoles. At what location(s) are you using them, the front wall or side walls?Greg
All of the EPS panels sold at Lowes, Home Depot etc. are low density that is 1 lb or less per cubic foot. I use high density (3 lb per cubic foot) All my panels are made in a massive EPS factory with computer controlled cutting machines accurate to .001" accuracy. My AutoCad drawings are used to drive the machinery. I spec the density used and since they are cut from a solid block when I ship the bare ones I ship the whole block (the "negative" or inverse of the panel is included) this offers the best protection during shipping. I have never seen the high density material sold commonly because the low density has better R value for insulation application due to the air bubbles trapped in the material. Since my material is 3 times denser, it is of course more solid which improves it's acoustical performance.
Thanks for the link, Bill. Look forward to the photo(s) of the back-of-the-room diffusers after you put them together.Jim
Thanks!And happy 2016, everyone.For anyone near a big hardware/lumber store in USA, that diffuser is almost silly easy to make, nearly all the wood pieces can be bought cheap and already in their needed dimensions, and need only a nail gun (or even hammer and nails) to put together. Biggest issue is whether you or your Significant Other can tolerate something that large in the room.
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