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Raw frequency response plots show clear difficulty getting a good seal to retain bass response. The ears of my dummy head are harder than real ears, and getting a seal on on-ear headphones can be quite challenging. On my ears they seemed to seal much more reliably. Still, be aware that getting a good seal can mean the difference between solid bass response and something less with reduced tightness of bass. Above around 200Hz, frequency response seems quite stable with headphone movement.
Run-up to 3.…