OK - this is for guido and others involved in the "surround" debate. These are customer items and NOT for sale...
A few caveats:
(1) Pictures are cropped and labled to prevent our infamous EU scammer from stealing them...
(2) These are ALL original cones, terminals and parts EXCEPT the 2121 has an aftermarket foam kit.
(3) 2123 and E110 use the same basket / magnet and various terminal locations depending on year made.
(4) The D/K/E 110's use an accordian cloth surround ( didn't have one available for pix ) and an aluminum dustcap.
(5) YES the 2121 dome is inverted.
(6) NOTE the big difference on the newer 10 ( 2012H ) - MUCH deeper coil / gap and larger magnet....!
(7) LE110/111 A/H and other various home models used a variety of cones, color frames and other subtle differences but USUALLY had foam surounds AND deeper coils than the pro midranges. They look otherwise identical in construction.
(8) I do **not** have detailed gap sizes, magnet flux measurements - please contact JBL
...
sub
http://www.northernacoustics.com/ebaypix/LE10Afront.jpg
http://www.northernacoustics.com/ebaypix/LE10Arear.jpg
http://www.northernacoustics.com/ebaypix/2121front.jpg
http://www.northernacoustics.com/ebaypix/2121rear.jpg
http://www.northernacoustics.com/ebaypix/2122Hfront.jpg
http://www.northernacoustics.com/ebaypix/2122Hrear.jpg
http://www.northernacoustics.com/ebaypix/2123Hfront.jpg
http://www.northernacoustics.com/ebaypix/2123Hrear.jpg
http://www.northernacoustics.com/ebaypix/5-10front.jpg
http://www.northernacoustics.com/ebaypix/5-10rear.jpg