P, where a particular speaker causes an amplifier to immediately shut down, that indicates an internal short in that speaker's wiring which wouldn't necessarily include a driver itself being "blown". If you can open up the speaker to see if a speaker lead has come loose that would be helpful. In any case, it wouldn't appear that changes to crossover settings and frequency adjustments, whether done manually or by an automatic system, would have such an effect.

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Enjoy the music, not the equipment.