What isolation feet under your amp with great result?

Indeed. Everyone shopping for these solutions should use that to tool. Good recommendation.

Tried Isopods, & Herbies Tenderfeet under two different integrated amps I own - Audio Note Meishu Tonmeister and an old AN Soro. Found that the sound became mushy and much less interesting to my ears. I've had the best results under each with some old Mapleshade brass footers (the heavier the better) that I've had forever. The approach that worked best for me was anchoring the music makers (amp, dac, etc) and floating the noise makers (TT power supply). For floating the TT power supply, I'm currently using a thermal isolation silicon foam pad from an surplus space-grade test setup (-58°C to +128°C at the time) we had at work with 3 Isopods on top of that. Hope you get to where you want to go.

Noob question perhaps, but how can isolated feet contribute to better sound quality?

I, too, found the Herbie's products to make things sound a bit mushier as well, and I've tried 3 different types of their products. I'm still waiting for my Isoacoustic Oreas to arrive and just found out it took 4 days to go 14.5 miles, from Niles, Ill. to Chicago, Illl. and now they seem to be on the way via FedEx ground and pound to the Los Angeles area.

Original delivery was supposed to be yesterday. Go figure. By their track record, I should get them by the end of next week, if not the week after.

All the best,
Nonoise