Rob80b
Headphoneus Supremus
Smaller driver?
Besides Jude's quote also just came across this...a bit more insight to the 58X driver
https://diyaudioheaven.wordpress.com/headphones/measurements/brands-s-se/hd58x-jubilee-massdrop/
"The driver of the HD660S is slightly larger in diameter so the drivers are definitely not the same. And NO this is not a HD555 driver either. Yes, the same magnet and plastic frame is used (as in many Sennheiser models) but has a VERY different voicecoil (different impedance) and membrane/cone."
The same site also gives instructions for modding also....download the pdf here.....YMMV
http://www.mediafire.com/file/8dr7hp34vq11aag/HD58X+evaluation.pdf
"Those looking for a low cost HD660 replacement can be quite happy. The good folks hoping to find a real HD580/HD600 replacement preferably with a 'fixed' bass response and less 'hot' around 4kHzcan also be very happy."
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