Cross-post for all interested headfier.
A&K SP3000 vs Shanling M9+
Disclaimer: I only received the M9+ yesterday afternoon. I notice the signature is still changing, it hasn't had a burn-in yet. I won't go into details because that would really take too long. Impressions are pretty mixed so far, it is too early to make a safe decision.
Basically, both are quite different. About the signature: the SP3000 is neutral-warm, the M9+ is warmer. The M9+ has a stronger bass foundation and more sub-bass and mid-bass punch with longer note delay. The SP3000 is a little lighter in the lower end. The transition from sub-bass to mid-bass is faster, so the note delay is quicker. This means a little more texture and resolution in this area. The mids/vocals and upper mids of the SP3000 are brighter, clearer, more dominant and with more resolution. However, I'm not so sure that this is such a positive thing. In fact, this aspect always bothered me and I tried not to focus on it because I didn't want to change the DAP. But now this could potentially even be a dealbreaker for me. Because, watch out here: 1. bright, clear and dominant vocals sometimes sound a bit strident. This is very clear with Mentor. In fact, there are some tracks and artists (e.g. Muse, Cocteau Twins, Kölsch, CamelPath, Rüfüs du Sol) that I simply can't listen to, it just bothers me. 2. and my second dealbreaker is connected to this point: when the mids and upper mids are so dominant, they rob the scene in the bottom end and the air in the top end. This is particularly noticeable in the soundstage: the focus is on the mids and the volume is geared towards them. As a result, information is lost in the background (i.e. again: in the bass and treble range). The soundstage sounds like it's lacking, precisely because the mids are dominant. This is particularly noticeable when you compare the SP3000 with the M9+. However, I particularly like the treble. They are clear and defined. The contrast with the bass range is quite good, but not with the mid range, as this is already bright per se. That's why some music (in which the mids and treble are bright and forward) simply doesn't sound good, it just bothers me.
Now comes the M9+. The sound is in the analog and emotional range. I have already written about the bass foundation. The mids are warmer than on the SP3000 and (only!) a little more in the background. The highs are smoother. This results in a full-body sound. This has the advantage of great immersion in the music. The soundstage here is really incredible. It is notably larger in three dimensions than the SP3000 and above all more holographic, there is also more air in between. I had such "wow" moments earlier with the Xe6 and Mentor that I never had with the SP3000. Everything melts together here, there is no dominance of the mids and no element in the frequency range that somehow interferes. In this sense, the M9+ is more coherent. Fir Audios sound so freaking good. The music is a single flow and you swim in it. What I would like to see is more energy on top, then the M9+ would really be perfect. But it's still too early to draw any conclusions as the device is still new. The sound will certainly continue to change.
By the way: now I understand why I couldn't like the Traillii: bright and dominant upper mids - yep, just like the SP3000, you've been paying attention! Too bad I don't have it anymore, I'm very sure that Traillii with the M9+ would have been a really good pairing! Still: Mentor tends to be sibillant with the SP3000 (again: upper mids/lower treble), but with the M9+ it sounds really good. The same applies to Anni. Yep, that's real: stronger AMP, the M9+ drives Anni better than SP3000.
Further, the M9+ has a total of 4 gains and the difference between them is audible and I swear I can hear the difference between the filters - I even tested it blind!
I do not consider other aspects (build, UI, etc.).
Sorry for linguistic and conceptual errors, I wrote from the gut without thinking.