Hi Rgs92, the CDSD was used with an SK Research shelf and two sets of Thorp Audio Group cones, one set above and one set below the shelf. There are other solutions which are probably quite effective, but the fellows who came up with these products took many years to do so and are meticulous. The shelves, which are part Baltic birch plywood along with Kevlar and lead pellets inside, are so tweaked they haven't found a stain or varnish that doesn't change the sound, yet they're straightforward to set up. The cones are the other part of the formula. I can't wait to try the combo under the turntable line I just added.