Quote:
Originally Posted by
Salvatore 
I opened the back grill and see only plastic and some wires (photo added). Are these even fully open with that plastic wall? And for the sake of comparison I'm interested to know what's inside your Q701's?
Ok, that grill and plastic part is basically identical to the K702 then. The Q701 is probably labeled as Semi-Open from AKG due to the extra foam behind this small grill. The small grill on the Q701 also has a small nickle sized area closed off. I imagine the grill on the 65th is fully open and not closed off on the back of it.
So my guess is that this new 65th version has "special" drivers and the new pads that change the bass. Maybe it's really a lot bassier than the Q701 I have. This pair is no bass monster and I'm glad to not be wishing it had even more. Perfect quantity for me. I don't think even more would hurt it too badly though. Not really needed for me.
Thanks for opening it up and posting the photo!