Metrum does not really support converting the Amethyst to I2S, simply because an older post where someone converted one of their models to I2S brought them a slew of messed up machines, so you are on your own here.
Marcel is correct I should have mentioned that any mod voids warranty with exception of SD card. Outside of Euro freight and Customs rear their head - not to mention Courier risk. If you have a friendly Dealer they should be able to arrange for a qualified Tech in an electrostatic free work area to do any mods (and pass on at cost if worthy). I arrange this here as freight is a killer. I understand this applies to DAC3 as well - where already one ‘experienced’ person has had a costly mishap.
On the subject of Platforms it’s a mickey mouse situation with recordings and the different algorithms they use. You never know what you are listening to really.
https://alpha-audio.net/review/mult...spotify-vs-master-files-vs-vinyl-vs-cassette/