I posted the following is a DT660 thread, but thought I should repost it here too, since it is mostly about the DX50:
"I just had to share one of those audio Nirvana moments.
Since I only listen to classical, after reading this thread I picked up a pair of DT 660's.
One of my two portable listening setups is the ALO Rx-Mk3-B+ amp, fed FLAC files from a HiFiMan HM-602 DAP. This combo sounded quite good with the 660's, very detailed, decent soundstaging and overall good choice for classical. I gave it 8.5/10 on my personal evaluation system.
Then earlier this week I received an iBasso DX50. So . . . I replaced the HM-602 with the DX50 - still using the RX-Mk3-B+ and the 660's.
Oh boy, this could very well be my endgame portable classical music listening system. All instruments sounded so precise and perfectly placed (medium-wide soundstage); the bass seemed just right - it was there only when it was supposed to be there (and strong when it was supposed to be strong). The mids and highs had a beautiful musicality, yet sounded totally accurate. I was listening to Elgar's 1st symphony and ALL of the instruments sounded just right. It felt like sitting in row 12 in a big hall. Anyway, I could go on rhapsodizing, but suffice it to say that the synergy with this setup is high.
I rated it a perfect 10/10, and I've only had that happen 2 other times - with HD800's + tube amp + Amperex pinched waist and Siemens CCa tubes.
By the way, the DX50 firmware is atrocious - uber-buggy, you can't have apostrophes in your filename (try copying a French Baroque album and renaming everything; what a treat), crashes a lot, doesn't read all the files, etc., etc, etc. Anyway, the sound quality is great for classical and hopefully iBasso will eventually fix the firmware."