With regards to polarity in a multi way speaker with drivers wired out of phase to each other, my understanding is that this is done because for example the bass driver may have a second order crossover whereas the tweeter or mid driver may have a third order. You would wire one out of phase to the other so the and resulting sound would be all in phase.
Or if there is a physical distance difference to the voice coil one could be wired out of phase to the other again so the resulting music is coherently in phase when it reaches the listener.
So you should still try to observe correct polarity throughout the signal chain.Another thing to consider is older Jbl pro drivers have the black tab as the positive so some times could be inadvertently wired incorrectly
Or if there is a physical distance difference to the voice coil one could be wired out of phase to the other again so the resulting music is coherently in phase when it reaches the listener.
So you should still try to observe correct polarity throughout the signal chain.Another thing to consider is older Jbl pro drivers have the black tab as the positive so some times could be inadvertently wired incorrectly