Originally posted by Zilch

Recognize also there is no "ground" or "positive" involved here. The red and black are merely arbitrarily assigned phase designations. Speakers are AC devices; there IS no electrical "polarity" here. You can reverse the wiring to a system with impunity, as long as you wire all systems the same so as to keep everything in phase, or out of phase, as designed. That's how this thread started. Tom wanted to reverse the phase of all of his drivers. He could merely have reversed the leads on his input terminals to accomplish that....
Thanks and I read many link you give.

Yes you are right in all the way...

And my LF ir react in good way polarity + applied in red put motion in...

For the phase (where info JBL who claim this driver is connected is polarity inverse for best match phase ???

Or, if you prefer, what is protocol for phase test who determine what is exact polarity connection is better ???

thanks again.