I like 4 just for stability. If you have heavy interconnects and power cord it just seems more stable with 4. Some years ago I had a problem with a preamp falling off of cones when I was using 3.
I was at my Audio Research dealer this afternoon and he now has IsoAcoustics Gaia isolation feet. I borrowed a set to play with over the weekend. They are suppose to be really good. I am going to try a set of the smaller ones under my CD player. BTW they come in sets of 4.
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