What bit rate is the song Sashas refracted live? i noticed on my FiiO if i play any 24bit files for around 30ish minutes it starts to warm up a tiny bit. on my FiiO X5 Gen 3 my volume is usually 45 - 50 on 16bit files. and on 24 bit files depending on the genre it can be 55 - 65 or 70 even. (you know what im talking about as a fellow fiio x5 III owner )That is not mean at all Completely legitimate question - the Utopia is extremely easy to drive......so, I just hooked up my Senn HD650's, and I'm happy to report that - IMO - they drive these headphones perfectly fine. Now - I'm at 132/150 with a high res file - Sasha's 'Refracted Live', and the Norma is giving the HD650's a workout - especially with the low bass. Again....I'd be completely satisfied with this sound - others may contradict this vehemently - just relaying my experience.
The player is warm.....not any more than the FiiO at times. It certainly doesn't bother me or freak me out.
132 is quite high for an A&K DAP isnt it? :S