Ciao Guido,
Thanks for the precious clarification. As described in the ICE Power web site, the ASX2 is the 3rd generation technology, so what you said about sound quality make sense.
from the Ice Power web site: "The advancements include extended bandwidth, improved dynamic range and exceptionally low distortion, achieved through our novel and proprietary HCOM amplifier topology."
I have in audition a couple of ref100 MK2, powered from 2 days, and I wander how much better it will sound the 500M.
Ciao e grazie.
Giuseppe