I bought the Smart D200 player : https://www.aliexpress.com/af/Nondestructive-Smart-Player-D200.html
Really nice build, solid cut out CNC block, but it's a little bit bulky for a pocket. The sound is really nice though. The volume pot is high quality, no imbalance and a nice firm feel. Took me a while to figure out how to change the UI language to English, the UI isn't great, it's perfectly workable but sometimes two button press needed to recognize input, not the buttons fault, it's the cpu or . It came with 32GB SD completely full of lossless music, mostly Chinese music, but actually really awesome music, going to be listening to this stuff for a while hehe.
I changed the stock amp Muses8820 to Muses01 which actually made quite a noticeable difference, seems to be a transparent circuit, btw the amp output is Class A biased by 4 transistors. Next I'll change the two LPF opamps to Muses01. The differential conversion is done by OPA1642. Actual colour of the dap is rose gold/champagne gold, (kinda wishing I had asked for the black version so the black screen would meld with it).
The sound is very natural, less cold than the Zishan, not warm, just plain natural sounding, vocals sound very good, and the treble also is more realistic. The bass is meh, not in amount, there is enough bass, but it just doesn't wow me in any way like the mids and treble, actually the bass is a bit less defined than I'd like, which is no good for fast electronic music, but the actual tonality and timbre of the bass is better than zishan, great for instruments, acoustic, classical or even pop and classic rock, etc. Lossless 44.1k sounds noticeably better than 320 mp3 with this player, it is quite revealing and not very forgiving.
Current version of this dap is V4, they made quite a few changes since the original, now using Elna capacitors, better transistors, upped the DAC supply voltage to 7.3v instead of original 5v, and as far as I know this is the first portable player with maxed dac voltage of AK44995SEQ. To compensate for battery life they increased battery to 3800mAH (from 3500) and reduced opamp supply voltage from original +/-12v to +/-10.5v, yet we still get 1hr less playback life (now 6hr vs 7hr original) because of the big dac voltage boost. The V4 has completely redesigned power supply, now using Analog Devices ADP power chip with 3 big AMS1117 voltage regulators, these things provide a massive 1 ampere each.
