Moderately off-topic-
Had a colleague who reloaded 8 tired EAW SB850F (Flying) subs with new RCF L18p300's. Same model as originally loaded......except somewhere in late 1990's RCF had introduced an entirely new speaker named L18p300. They were completely incompatible with the box: unloading and popping, etc.
This is something I have never heard of. At one point I handled maintenance on a fair number of subs from different manufacturers that used RCF L18P300s (both the RCF and private label versions) but did not encounter this problem.
