This article is an update to the original one that I wrote: Sennheiser HD650, 600, and 580 Updated Drivers. Please read that if you haven’t.
I just want to update with more pictures of the old and new versions side by side. I managed to take photos of the HD580 and HD650 versions, but I couldn’t find an old driver HD600, so the HD600 is not here.
BTDT
The 580 and 600 drivers are identical so there is no need for the extra pictures.
After speaking with Sennheiser I have come to understand that there are no significant differences between any of the diaphragms as the “tuning” is done elsewhere in the respective headphones.
The 650 elements apparently have their own manufacture/assembly line in Ireland.
Mike
That makes sense. I probably need to add that the screen color is just an indication of what version you’re getting, but the difference may not necessarily be from the different material.