Thank you guys.
Actually the problem / annoyance is only on some letters (as mentioned the S-T-Z-C) that are overpainted-dirty-sibilant.
If the amplifier was a problem it would be brilliant and annoying on the whole range, even the musical one (see Yamaha which is very cold and annoying for my taste) while Nad is musically exceptional and also vocally unless there are certain conditions.
I think it depends on the Dalis.
I borrowed my rotel 1592 from the shopkeeper today I try it in my acsa next to the Nad so with the direct confropnto we have a more important feedback to understand.
In case as a "hot" amp to try which brand do you suggest? (although I doubt it depends on him).
@spyne:
As a "hot" amp to prove what brand you suggest (although I doubt it's up to him) if I can find one for test, even though Nad I don't think it's that cold right? especially when compared to Rotel.
@ Harmonic THD:
What do you mean by Nad has no sound? is it a bad non-music product? sorry but I have problems with the translator but I would like to understand if it is an acceptable machine or to be avoided.
Thanks for the help.