You Sir, just made my day!!!!!!!! Thank you so much!!!
By the way, I will try to make these 4623 suitable for home use so I will most probably change the internal cabling to something like 2.5mm2-3mm2 OFC copper for the E130 and 1.5mm2 copper(maybe silver plated) for the 2402H. The crossover will also get new components or it will be changed to other JBL type (finding good vintage JBL stuff in the netherlands is almost impossible and if you even find something, it is a few times more expensive than in the USA).
Especially the pics of the part which on the 2402 is mounted are helpful, just look how mine look like
https://picasaweb.google.com/1138664...eat=directlink
The units will be thoroughly cleaned and if I can't remove these spots from the E130, I will try to paint the cone very carefully with black ink with some water using a soft paintbrush.