https://www.mrwalkman.ml/p/dmp-300-fe.html
Setting the region to "J" is supposed to improve treble smoothness, but Rockbox needs you to reset the settings, and I cbf'd to do that.
You don't need to reset the settings, just turn the zx300 off and on again. Thats what mrwalkman recommends and from checking
for region-specific features after reboot it seems to work just fine.
Also I am uncertain if the region "sounds" are literal FR changes since most online measurements show the ZX300 to have a decently flat FR, but they do seem to change the sound. Maybe it's just different upsampling filters.
@JK47 the bass extension could probably be achieved with EQ, but it sounds like something more than that. I don't have a lot of time to listen critically, so can't say much other than it's different and kind of better. It's reversible if you don't like it.
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