Guys I found some really good readings about zx-500!!
- Many sound quality enhancement points / BT receiver and USB DAC function not installed
-equipped with four new polymer capacitors “FT CAP2” adopted in “DMP-Z1”
-POS-CAP capacity was also increased from 47μF to 100μF
-New high-quality solder" is used to improve the sound quality by adding gold to the headphone output, battery, and soldered parts of EDLC. It is said that Meister tuned the addition amount by repeating the audition.
-Since the streaming music distribution service can be played directly on this unit, the Bluetooth receiver function that was installed in the ZX300 etc. is omitted this time. The USB DAC function, L / R channel balance, auto power off, and level meter are also omitted.
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check it out
https://forums.hardwarezone.com.sg/headphones-earphones-portable-media-devices-314/return-sony-walkman-android-based-|-nw-a100-nw-zx500-6107926.html