I have two pairs of L-166's one is my dads that he gave to me and the other i got from a classified ad. The one i got from the classified has a component of the crossover that looks like it was added by someone over the yrs it is in the back corner of the box and is spliced into the LF driver line. I have seen the same thing on an ebay add for the L-166 cabs and crossovers. was this a common modification? and what the heck is it?