I've been pushing my Kann Max these past couple months and also done a lot of reading on all the AK players. I've discovered lots of things and grown a real admiration for this little power puncher.
One thing I'll say is that I've read widely that people think AK equalizers are ineffective. I have found the opposite, in fact, the power of the built in parametric EQ is quite real.
I bought a notoriously needing-EQ in ear, the Audeze LCD-i4. If you know anything about that aural piece of joy, you know how important it is to be able to adjust EQ to make it show its real abilities. The Audeze also famously require strong, clean power to harness that EQ and give you the necessary volume.
I have found the Kann Max to very capably handle these tasks and in reading about all the players out there in the price point, I'm thinking this AK could be an unsung hero in the myriad DAPs of its class as well as a real contender with its higher-considered siblings like the SP2k, though I cannot make a direct comparison. What I can say is that folks complaining that their AK EQ doesn't do anything may need to upgrade cuz this thing not only graphically allows highly precise EQ settings, but also makes those differences in the sound very distinctly evident and satisfying (unless you're listening to DSD which does not seem to allow the EQ at all, and maybe this is people's confusion).
Pairing that ability with the high, and even super gain amps, and magic occurs that sounds like nothing I've ever heard through IEMs or full headphones. I know that the TOTL must cost that much for a reason, but exactly how much better sound will you realize, 5%, 50%? I think it's got to be a game of diminishing returns at this point!
Finally, driving these LCD-i4s with the Kann Max is a beautiful pairing for me (ymmv, but see attached with modded Indigo wire) and I'm absolutely loving it, and all my other sets which I sometimes EQ (eg, I find CTM needs a little help, and am beginning to fool around with the HD800s).
I'll end with a complaint because what good hifier wouldn't with an AK!? I can't get any downloaded APKs to be recognized in the Open Service folder, including the XAPK Installer. This part is annoying, but at least the sound is great!