Music Alchemist
Pokémon trainer of headphones
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- Dec 17, 2013
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And just for reference, http://www.innerfidelity.com/images/SennheiserHD650.pdf
The 650 is practically ruler flat from 60hz to 1200hz. The M50x is visibly 8-10db from 30-100hz over its midrange response.
Everyone's ears are different, but the 650 is an objectively very flat headphone and the m50x is objectively, extremely bass heavy.
The HD 650 sounds somewhat warm, actually. You can't just glance at the graph to assess things; you need to superimpose compensation curves over it. I may share one for that headphone soon.
If you want linearity in the bass and lower mids, some of the high-end planar magnetics measure nearly perfectly in that respect, but have issues further up.
Here is the most neutral (across the spectrum) headphone I have heard/seen:
http://cdn.head-fi.org/6/6d/6de6f4f3_STAX_SR-207_EP-507_SB2217.png
http://www.innerfidelity.com/images/StaxSR207EP507LeatherPadsSerNumSB22217.pdf
I do agree that the M50x is far bassier than the HD 650.