I really don't see any reason for you to act like this. I merely expressed my opinion and you decide what you want to do with it. Actually, I didn't even do that spontaneously, but only because two headfiers asked me. I wasn't going to explain myself why I wanted to sell the SP3000. The fact that you are obviously so enthusiastic about the SP3000 is up to you. But let me tell you that the SP3000 is not the absolute endgame you want it to be. There will always be something better. That's a fact, that's the progress we're all so into. Now if you want to lie to yourself and believe that there won't be anything better, that's up to you. All I ask is that you show respect for what is written here in the forum.
I'm sorry, but I really have to speak out here: maybe it's due to a later firmware, but the UI is lightning fast - no lag, no shutter, nothing... everything runs smoothly and even the internet connection is more stable with Apple Music.
As an absolute lover of the soundstage, I also have to say that the M9+ is, on the contrary, deeper and wider. Again: maybe it's the firmware.
Otherwise, yes, micro details are better on the SP3000, but the M9+ has more air, so also better instrumental placement.
Gain is very helpful, as the sound becomes stronger. I don't know what your problem was here.
See above.
Despite all my criticism, I'm strongly leaning towards keeping the SP3000 and returning the M9+, just by the way...