Where to use Isolation devices

I agree, it appears that the right combination of coupling and de-coupling devices gives the best result.
I am going to try this approach with speakers as well, that's spiked speakers with Boston Audio tuneblocks for speakers under them.

I tried herbies rubber cup and black ball footers under my Modright Sony 5400ES and did not like the results. I then placed black diamond racing cones into each of the herbies cups and wow this improved the SACD player ten fold. It got rid of the slight brightness of the black diamond cones yet kept the detail. I placed the herbies balls by themselves under the separate tube regulated power supply and am pleased with it.

Thanks Mceljo for the clarification. When I heard the Sort Kones, they were under a very high end Meridian cd player and the top of the line JM Lab Utopia's with some sort of expensive SS monoblocks. There was a lot of resolution and detail, so it was pretty easy to identify the difference.

Sean34 - I also heard a demo using Focal Utopia speakers (I think it was the Scala). It wasn't a perfect setup because it was during an event where there were a lot of people in the store, but I could convince myself that there was a difference. What I told the salesman was that I could hear the A/B difference, but I doubted that I'd ever notice if they were not installed and nobody let me in on the secret.

When I did some A/B stuff at home I can easily describe the difference that I hear. On one particular CD there are areas about half way to the center from each speaker where I can almost hear things overlapping without the kones, but with them installed everything has air around it. It sounds like snake oil to me when I say it out loud, but it's my placebo and I'm sticking with it.

Ironically, I installed foam corn pads (i.e. donuts) on the bottom of the SACD player to prevent it from sliding off of the kones and I swear it sounded worse than without. That's an even harder setup to A/B, but I took them out. My theory is that the foam pads were providing a level of damping that was directing the vibrations around the kones.

Have a question that runs a bit tangent to the above, but assuming specified weight limits are not surpassed, is it preferable to use as few isolation feet as possible? i.e. the logical arrangement is to put four feet under a piece of equipment for solid balance, but if going by specs, two is sufficient for the gear in terms of weight, on paper is that the way to go?

In real world of course such balancing acts on pricy gear may not be for the faint of heart, but I have been given the impression previously that if you could you should. Not sure if this is true or not. Would like to experiment myself at some point, but was just curious if anyone has any opinions on this, real world or theoretically.