Sennheiser HD 560s Open-Back Headphones - Official Thread

Headphones Official Headphone Model Discussion
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There has been at least one change, possibly two. There is a bit of conflicting info about if/how the sound has changed.

Here’s a link to a trustworthy (in my view) site that has good info about this: HD560S revisions

New study by Dr. Olive and Dan Clark on the Harman target and its compatibility (or lack thereof) with current measurement rigs