I've got an Olympia and an MP150. I prefer the Olympia by quite a bit. In my experience the MP150 was a little forward in the high frequencies - not really grainy, but fatiguing after a few songs. For what it's worth, I got it after having a 2m bronze which i straight up too bright. The Olympia just sounds really fun/pleasing - it's not gonna give you the last word in detail but you'll be able to listen for a long time and it's really engaging. I know the thread is asking about the amethyst which I haven't heard, but am very curious about. If it's got the Olympia warmth with a little more detail that would be peeeeerfect.
I would not buy a nag cart thinking it's gonna be warmer than the Sumiko's - unless the amethyst is SUPER dry/cold sounding.
I would not buy a nag cart thinking it's gonna be warmer than the Sumiko's - unless the amethyst is SUPER dry/cold sounding.