I suggest you consider Herbie's Audio Labs products. I use them under my 115lb speakers, amp and streamer dac....I'm very satisfied. I had used the cork-rubber sandwich squares under my Vons for years and recently switched to the small glider feet. I was not expecting anything but the bass got a little more defined and the soundstage improved side to side.
IsoAcoustics Iso-Puck vs. Iso-Puck Mini
Theoretically, one could use either of these models as footers on equipment weighing <=24 pounds (each "mini" can support 6 pounds: 6x4=24). The "minis" are a lot cheaper than the standard Iso-Puck. Has anyone compared the two on equipment <=24 pounds? Does the standard Iso-Puck offer any advantage at ~$240/8 vs. the "mini" at $99/8?