To be honest I don't think these two are the same. AutoEq is written in Python, Crinacle's graph tool is written in JavaScript, and they don't seem to share much code, if at all, or even to be developed by the same people. But yes, Crinacle's graph tool should do the job just fine.

You got mixed up in sensitivity units: 104dB/V (not dB/mW) adds up to 84dB @ 0.1V, not 89.

So basically, 104dB/V means 104dB SPL peak with the 1V maximum output of the Apple dongle. Isn't this loud enough? I personally use 108dB/V IEMs with my Apple dongle and never set the volume above -20dB (otherwise it's just too loud for me) so that's 88dB SPL peak. The HD600 would still have 16dB of headroom at my listening level. So from a theoretical standpoint, it looks like the Apple dongle could drive the HD600 loud enough, at least for some people? Am I missing something?

AutoEq is both a tool to generate EQ parameters to go from a source frequency response to a target frequency response, and a collection of EQ parameters (presets) generated with this tool. The problem is that the target frequency response used to generate the presets is (according to most people) crap. So the presets don't sound good. But AutoEq (the tool) can still be used to generate EQ params for the target of your choice, and does it very well.

Surprised nobody said anything about the Google dongle yet 😁 It does the job, but it's honestly nothing to write home about in terms of sound quality. Considering you just got yourself a nice pair of premium IEMs, you might want to consider upgrading to a better dongle / DAC/amp in the future to unleash the "true potential" of the Blessing 2s. Even something as cheap as the $9 Apple dongle was enough for me to hear a noticeable improvement in sound quality (everything sounds tighter and more detailed, soundstage is wider, etc.) Btw I don't mean to spoil your fun, I just thought I'd mention it since the Blessing 2s are apparently great IEMs but the Google dongle is just "meh". Thanks for the review, have fun with the B2s!