@shrapnel Fair question! What I mean are vibration/resonance absorbing/defeating products that your components rest on, on your rack instead of the components resting on their own feet. It is one of my favorite tweaks to play around with. I’ve got a bunch of Black Diamond Racing cones and pucks most of which are in the closet as I have found them to impart a "glare" to the sound. Like many enthusiasts, I’ve tried sorbothane sheets and pucks as well. They have sort of an opposite effect on the music as they "dull" the sound and rob it of dynamic swing.
What I’ve found to be best in my system and set-up are Herbie’s Audio Labs Tenderfeet, both regular and firm versions. The regular Tenderfeet are good for taming an amusical brightness to the sound without robbing it of its life. The Firm Tenderfeet are better under "warmer" sounding pieces of gear.
I also mix and match the Firm and Regular Tenderfeet to get just the right sonic balance. I would be willing to bet your cj gear would like the Firm Tenderfeet. I will include a link to Herbie’s site. I would encourage you to email or call Steve and Robert Herbelin, the proprietors of Herbie’s. They will advise you based on your system and listening preferences. I’ve corresponded with them many times to great affect. They will not just try to sell you their most expensive products. They want you to be satisfied with their products and consider them for your future needs.
http://herbiesaudiolab.net/compfeet.htm Hope this is helpful.