I am still waiting for my NOS External DAC to arrive. The sounds from the Kaiboer H1055 without an EXTERNAL NOS DAC gave me a quite good sound quality on MP3 and FLAC. So, my hands got itchy again and try to upgrade some caps with values 220uf, 470uf in the USB area, output area... I upgraded it with some .01uf MKP 1837 and .0047uf NOS oil cap(for bypass). I replaced 1pc.470uf and 1pc.270uf with 4,700uf Panasonic FC Caps. Now, I am happy with the sound quality. It sounds like I am already using a CD Player with good DAC. Though, I am expecting better sound quality once I use an external NOS DAC with the Media Player. Here are some pictures to share. This is only my hobby...D.IY wanna be.
So, I am not encouraging you to upgrade or modify yours. You ask you tech guy for better upgrade or modifications, if you are planning to.
Some Review after the upgrade: (using MP3 files...FLAC has better SQ, of course. So, I just use an MP3 format to know if there is a big improvement)
Soundstage is wider.
Cleaner and more details.
More Musical.
Instrument and vocal separation are quite good.
Depth became noticeable.
Thanks for looking.