For a size comparison, here's the Sennheiser MOMENTUM with the Sennheiser Amperior (the Amperior is the same size as the well-known Sennheiser HD 25-1 II).
Can you comment on the sound, even just in relation to the Amperior? I read that, for the MOMENTUM, Sennheiser is using a driver very similar (perhaps, identical) to those used in the Amperior/HD25-1 II.
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