sound is not what expected

Hello everyone,

In the last 6 months I have purchased a combo which I expected to sound "good".

I have the SN2 into NDX on dac.    Results : I can hear the music, but it doesn't sound even close to what I expected.   I can resume that it sounds dull. flat, no finesse, like if the middle portion of an hypothetical equalizer (middles) is up and all the rest is on zeroes...  That is even though the system is wired, with focal 936.  cabling seems to be properly applied...    Pretty much dissapointed.     Is it that important to have a PS?  Or what???    

I don't know what naim sound means, but if it's what I hear now...  well... don"t know what to say.

Matbe it"s me???