I had some ceramic cones and TerraStone Footers I was using on my previous equipment, that made a noticeable difference in sound quality, but when I tried them under the DMP, DSD and BHK 250, when I was still breaking them in, they seemed to exaggerate some of the negatives associated with the break-in process. Now that everything has broken in, I tried them again, and they definitely helped increase the musicality of the system. In the process of pausing songs, and adding footers under each piece of gear, I noticed a brief ringing immediately after hitting the pause button. I figured out it was the hollow rectangle tubing of my equipment rack. So I tried applying some Blu Tact on the metal frame in an inconspicuous place, and it helped deaden the ringing when tapping on the metal frame. By accident I noticed it deadened the ringing even further when the Blu Tact was applied on the framing, and also made contact with the high density fiberboard shelving. Now when I tap on the equipment rack it makes a dull thud. Upon listening again things sounded much more relaxed, with a noticable increase in clarify.
This was another lesson in the fact that everything matters, when it comes to the SQ of your Hifi rig.