Hi Martin,
I think it may possibly be down to the overall contact surface area, which is miniscule when the Isonoes are on the glass 'coasters'...
I'll bring one of the glass shelves on my Mana rack down next time and place it on the top of your rack and we'll see what happens ;)
However, there's no doubt that your Techie sounds excellent, regardless of the fact that your Isonoe feet are in contact with a wooden surface.
I guess that the isolation properties built into the design of your rack compensate somewhat for the (arguably) Isonoes' sub-optimal coupling with wood, whereas on an ordinary wooden cabinet or table, results may be different. That's certainly what I've heard.
However, there are simply too many variables to know for sure exactly what is happening. The most important thing is your Techie sounds utterly fabulous, regardless (especially with the Paul Hynes SR5 PSU)! :cool:
Marco.

