I was looking for an alternative to the felt mat for a Rega P6 turntable. My local store suggested the Les Davis 33 1/3 D mat made from "constrained layer damping" technology. See website Products — Les Davis Audio I must admit I was not convinced by all the marketing blurb, but my friendly local store offered to demo it on a Rega P8 with Apheta 3 (can't remember the amp or speakers). So we did a quick A/B test using Brothers in Arms. The lower mids had more push and the upper mids had greater clarity. It was an obvious difference. Enough to convince me to purchase it and take it home. When I got home I could do a far more lengthy comparison on a system I am familiar with. It was similar to what I heard on the P8, there is more beef in the lower mids. Particularly shows up as more emphasis to the start of kick drums and more presence to bass guitar. There is a greater ability to hear into the mix. I suspect it is tidier in the upper mids. This also shows as an ability to pick up overtones on acoustic guitar and more of the decay to sounds like ride cymbal and even reverb on vocals. I also thought a brass section sounded more like 3 horns individually and less like one combined sound. Also, while I don't have a problem with sibilance, I think there is less harshness to "s's" and also quavers on high-hat or ride cymbals. So I am one happy camper with a very worthwhile tweak for modest outlay and would recommend to anyone with a Rega deck. Probably works well on other decks but I have only heard the impact on the P6 and P8. Has anyone tried the Les Davis 3D2 isolating pads for sources? After trying this mat I am interested in how well they work.