Need more clarification, OK, no problem: Among the mobile playing solutions I have tested, I found the sound pairing/matching best with a Sansa Fuze. Normally I use Fuze rarely. But for mobile needs of X2 I use it specifically. Other players which I tried also sounds very good (Listenable, enjoyable...). But something magically special with the sound of Fuze pairing (Rockboxed, FLAC files) for me. With desktop equipment it sounds the best.