My guess to Sony mdr-z7:
A coaxial driver with two transducers,
A 50mm transducer with a carbon-plated liquid-crystal-polymer membrane,
A 70mm ring-shaped bass transducer with a liquid-crystal-polymer membrane.
Dual balanced driving.
Unknown material in unknown back.
http://www.turboimagehost.com/p/19601309/sony_mdr-z7_leaked_info._img1._4.jpg.html
My guess to Sony mdr-z5:
A coaxial driver with two transducer,
A 40mm transducer with a liquid-crystal polymer membrane,
A 65mm ring-shaped bass transducer with a liquid-crystal polymer membrane.
Metal chamber in closed back.
http://www.turboimagehost.com/p/19601310/4682287.jpg.html
reference:
http://tieba.baidu.com/p/3198042977
http://bbs.imp3.net/thread-11175188-1-1.html
Confirmed:
mdr-z7:
Dual transducer.
A 50mm transducer.
A 70mm ring-shaped transducer to be dedicated to generate sturdy bass.
Special-material-plated liquid-crystal-polymer membrane.
Balanced driving for griping the bass.
Metal chamber.
Cost 4000rmb at jd.com.
Unconfirmed:
mdr-z7:
A 50mm ring-shaped transducer.
Special-material-plated on both the membranes.
Semi-opened back:
http://www.turboimagehost.com/p/19643858/Sony_mdr-z7_back_from_loxpo.png.html
http://www.turboimagehost.com/p/19643857/Sony_mdr-z7_back_from_imp3.jpg.html
http://www.turboimagehost.com/p/19643856/Sony_mdr-z7_back_from_erji.png.html
http://www.turboimagehost.com/p/19643861/Sony_mdr-z7_wires_and_back_from_loxpo.jpg.html
http://www.turboimagehost.com/p/19643860/Sony_mdr-z7_wires_and_back_from_imp3.jpg.html
http://www.turboimagehost.com/p/19643859/Sony_mdr-z7_wires_and_back_from_erji.jpg.html
mdr-z7 & z5:
Start selling at the end of october.
reference:
http://www.loxpo.com/thread-496-1-1.html
http://bbs.imp3.net/thread-11176387-1-1.html
http://bbs.erji.com/read.php?tid=1699932
http://tieba.baidu.com/p/3198042977