When you guys say upper mids, which frequencies do you talk about? Because I did some more comparing today of my Elis8 with my CLR, and tweaked the output EQ of the Axe to better match the Elis8 to the CLR. I had to pull down 250, 500, and 1000 hz A LOT to get rid of the boxiness. Also add some for 4, 8 and 16k to open up the treble some. I really don't like the sound of these without EQ, they're not FRFR by a long shot.
I'm asking this, because 250-1000 hz are not upper mids. They're low mids (250 hz is borderline bass/low mids), and mid mids. High mids start at around 2k, but I find that it's the ugly and muddy mids that dominate the sound. At least with my units. They might be broken as previously stated (or at least I hope they are).
I'm seriously contemplating whether I should give another pair of Elis8 a shot, or simply go with a couple of EV PXM-12MP instead. Might even sell my CLR and get 3 of them (guitar left, the rest of the band + vocals, & guitar right). Having the separate non-guitar monitor helps separate audio by which direction it's coming from, so nothing fights for the same space. I've been doing it a long time with a mono guitar monitor and a regular vocal/band monitor.