SCYJ
100+ Head-Fier
I listened to the GM at CanJam vs the Volür. I would be happy with the GM but would keep the Volür. Which is good because I'd have had to sell the Volür at a loss to finance the GM. Which I would have done. Either way they are both great IEMs and it's just subjective personal preference. I liked the bass and mids better on the 64 audio. I thought the switch on the GM was a cool idea, but the mids were a bit too 'quiet' with it off and too much with it on. That was just with 20 min though. Ultimately I'd rather have both and really enjoy them each before deciding. But that's in a perfect world
So the "slightly recessed mids on the GM" issue (which many people here seem to share), I actually oddly enough don't have that issue.
I'm running the GM off the MUB1 and using the upgraded FF GPS cable, Black module vocal off.
I actually perceive the GM to simply be neutral with bass boost I wouldn't even consider it V/U shape. Maybe W or L shape. But on some songs I still do find vocals a little more forward than neutral. Female vocals, in particular, still seem to take center stage. Perhaps male vocals might sound a teeny bit recessed compared to female vocals, but I listen mostly to female vocals anyways.
But I suspect this is due to the way my ears are. To give some examples, the Elysian Diva and Anni 23 had vocals that were too forward for me, like they were in my face and suffocating me. EE Odin and Kinera Loki were so shouty I nearly died. Storm has incredible mids but I must say it's still too thick for me. I also own the Monarch MK2 and while many find it neutral, I do consider it a slightly inverted-V shape. So it might just be my hearing that's either not picking up subbass and treble well, or just more sensitive to mids. I did run a sine sweep multiple times and I noticed sensitivity around 500hz-750hz, and somewhere around 1.5khz-2.5khz, so perhaps this is why the GM's vocals come across perfect for me. And why I never found the Z1R mids to be offensively recessed.
Obviously, everyone's ears/hearing is different, so YMMV
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