Given the recent apparent confusion over the polarity of the woofer relative to the mid, horn and slot its worth spending some time understanding these diagrams.
Referring to the equivalent 3145 schematic you will note the polarity of the terminations to the mid/horn and slot are inverted after the L Pad.
What does this mean? Inverting the polarity will result in the driver voice coil pushing the cone outward rather then inward per JBL convention. This applies to the positive swing on an a/c sine wave as well as the simple 1.5 volt battery test.
http://www.jblpro.com/catalog/suppor...LSpecific.aspx
JBL did this in the4345 design due to the way the passive woofer to midrange filter works and results in a smoother response transition at the woofer / mid range crossover point. It is important to note the mid, horn and slot must all have the same wiring polarity to the crossover.
For how to wire up the 4345 clones floating around recently please find below some pics and graphs.
I will post a pic over the weekend of a correctly wired L pad