A couple of observations from 2021, not so profound as some of the above:
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The ZMF Aeolus is what you get if a Focal Clear (OG) and Modhouse Argon (take your pick, I have a Mk 2) got together and had a love child
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For the contingent of people who say friends don’t let friends listen to ZMF headphones through a solid state amp, I say they still sound pretty great!
My reference points are a bit limited, but I recently got a Schiit Jotunheim 2, which joined my Lyr 3 and Bifrost 2. The Aeolus sounds great with either amp, slightly different but still great through the Jot 2.