I have been auditioning 3 of the Appogg isolation platforms in my system for the past 2 weeks. I have had them under my transport, my dac and my tubed preamp. This afternoon, Scott and Aaron came by so that we could do a comparative listening with the platforms in the system and then with all 3 of them removed. With all 3 removed, the sonic difference was easy to hear - to me it was a loss of air around performers and seemingly moving the performers closer together towards the center of the soundstage. There was a loss of delicacy in the upper frequencies and some loss of depth in the soundstage. Perhaps the bass was a not quite as tight as well. We then put the platforms back under the transport and dac and a lot of of this vanished. We then put the last platform back under the preamp and while not as dramatic a change as putting back the first 2, it still was an audible improvement and completely back to what we heard before removing all 3 platforms. I went ahead and purchased all 3 platforms. By the way, Scott and Aaron do give great customer service. One of the nice things about the platforms besides the improved sonics, is that even though for maximum effectiveness, the platforms need to be sized for a specific component's overall weight and weight distribution, if you change a component, Scott and Aaron can modify the platform for the new component's weight and weight distribution (assuming the new component will fit on the plinth).
