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@h2o
I had the Shure 425s for many years, recently upgraded to the Aonic 4s with the second-gen true wireless doodads and I think they’re a great improvement - the 425s are monitors and quite flat/clinical, whereas the Aonic 4s are much richer and more enjoyable. Combining the in-ear isolation with the noise cancelling makes even the screechiest tube lines tolerable and I love them on airplanes. I think the sound is just as good as my Momentum 3s (which I mainly use when I’m at home). But just my personal opinion.