I love the 660’s speed and overall feel. But felt it was not enough mid presence like the spectacular HD60”‘a mids, and significantly too dark in the treble and not quite enough sub bass.

Let’s hope for another “Grey speckled recycled plastic” classic HD6__, hopefully in a l three Grey color than the HD600 old speckled charcoal color.

And with all the technical advantages of the HD660, but with the exact same tuning from 500hz-5khz as the HD600, air like the HD800s, and sub bass like the HD650.

This would finally get me to own and keep my very first sennheiser