Ozzy ...
You’ve discovered one of the the mysteries of the Omega E Mats.
As I stated in a previous post, initially, the mat actually degraded the sound of my system. That lasted for about a half day or so. Then the improvements started to appear.
In discussing this with Tim Mrock, he concluded that it was because I had used an inordinate amount of TC throughout the system and elsewhere inside and outside of the house. It took time for both the TC and the Mats to gel with each other.
I believe that there is some type of energy being thrown off by the Omega E Mats and that they somehow "charge up" the components that they rest under. Its kind of like pasting every part of a component with TC including the chassis, transistors, capacitors, and even circuit boards. Doubling or tripling up of the E mats increases the phenomenon.
I believe that when the Omega E Mats, or in your case the one mat, is removed, the "charge" remains for awhile, then slowly dissipates. This would account for the initial improvement you heard in your circuit box with the mat in, and then not noticing much of a difference when the mat was removed, only to find a return to improvement when you returned the mat to the circuit box again.
Call me crazy ... but I think these Omega E Mats have life. Same for the TC. I think Tim has hit upon a product/invention that will go way beyond the limited use we audiophiles will be putting it through.
At this point, the improvements in the SQ of my system with the TC applications and the six Omega E Mats, have brought the system to the point that I have absolutely no desire to upgrade any electronics or speakers from now on.
The system plays music that gets me totally involved in the performance ... and its as close to "live" music as I’ve heard from 99% of systems out there, including mega-buck systems. Its limited of course by scale ... but only by scale.
By many accounts, my system is fairly modest price wise for "high end." I put a pencil to it the other night. Had I bought everything in the system new, with no discounts, the retail value would be in the $70,000 range, not including the TC and the Omega E Mats.
Frank