I'm about to buy a pair of JBL L300.
The guy who selling them replaced the diaphragms in the 077s with original JBL's (the D16 type), when I asked him about the impedance difference (the original diaphragms were 8 ohm and the new are 16) he said that technically (and electrically) there are no difference and the important issue is their thickness. I would like to know if this is true and where can I read something about it.