Unfortunately I don’t think Sony sell the ZX300 series anymore.
They sell the ZX500 series currently, it runs android, is missing USB DAC functionality and has regional volume restrictions which completely gut the potency of the amplifier, and for which there is no known workaround currently as root has not yet been publicly obtained.
I bought a zx500 because I wanted access to my streaming services, on top of my usual Flac library, because I cannot trust myself not to fiddle around in a web browser on any other machine haha.
The only thing I’m not happy with is the volume limit (I have an EU machine). It doesn’t leave me any headroom on insensitive planar magnetic headphones like Fostex T50’s and Dan Clark Aeon’s. Worse than that, they limit the 4.4mm output to the same power output as the 3.5mm and have removed high/low gain completely in software in these systems
They sell the ZX500 series currently, it runs android, is missing USB DAC functionality and has regional volume restrictions which completely gut the potency of the amplifier, and for which there is no known workaround currently as root has not yet been publicly obtained.