I agree with Onhwy61 as the very first starting point. An equipment rack, wrongly placed, will destroy ANY advantages your player has. This has happened in a friend's room, the non-audiophile type. I had to move his equipment rack -- made of wood -- 1/8 inch back and forth. I've been doing this for a VERY long time. We're talking months and years, and I finally found the spot -- IN THE SAME CORNER! -- where the sound isn't scrunched together. Turns out his floor was uneven in that very spot.
Otherwise, I'd use Walker Valid Points. However, be very aware that, as with other devics, you will need to position these devices CAREFULLY. 1/8" in any direction can dull the sound. I have found this to be the case with ANY resonance-damping device, including Tube Traps, of which I have 50 and I've had them since 1988. All devices seem to have one spot where they are superb. Place them and listen for complete harmonic structures, from fundamental to overtones. The place where you get the most complete structure is the location in which they should remain. And you can mark the EXACT location with a magic marker that's washable, so you can remove it if you sell it. It's a lot of trouble, but I've been doing it for years, and only recently did I even realize that the "airiness" in the upper midrange is highly affected by the placement of room and resonance devices. I knew they needed to be correctly placed, but does ASC, for example, tell you that if you have two Tube Traps stacked on top of each other, than the seam of one may be turned very, very slightly out of alignment with the one below? No, and neither does anyone else. Be very analytical when doing this.
Otherwise, I'd use Walker Valid Points. However, be very aware that, as with other devics, you will need to position these devices CAREFULLY. 1/8" in any direction can dull the sound. I have found this to be the case with ANY resonance-damping device, including Tube Traps, of which I have 50 and I've had them since 1988. All devices seem to have one spot where they are superb. Place them and listen for complete harmonic structures, from fundamental to overtones. The place where you get the most complete structure is the location in which they should remain. And you can mark the EXACT location with a magic marker that's washable, so you can remove it if you sell it. It's a lot of trouble, but I've been doing it for years, and only recently did I even realize that the "airiness" in the upper midrange is highly affected by the placement of room and resonance devices. I knew they needed to be correctly placed, but does ASC, for example, tell you that if you have two Tube Traps stacked on top of each other, than the seam of one may be turned very, very slightly out of alignment with the one below? No, and neither does anyone else. Be very analytical when doing this.