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Internal crossover jumpers of B&W 801 matrix S2

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Hi,

I know there are internal crossover network jumpers inside the B&W 801 matrix S2 speakers. The jumpers for the positive between LF and HF were for sure removed, as I can bi-amp the speakers w/o any issue. Because the phase of my preamp is inverted, I need to invert the speaker cables on both speakers. However when I does this, my amps are shutdown due to protection. I suspect there are also internal jumpers on the negative terminals from LF to HF. Because the speakers are super heavy and the crossover networks are at the bottom of the speakers. It is difficult to open the speakers to check. Could someone please confirm there are also internal jumpers on the negative terminals?

Thanks

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