Passive bi-amping IMO, is not worth the effort.
You will not increase the dynamic range or prevent low frequency signals from impacting the high frequency response, as in active bi-amping.
One of the main benefits(maybe THE main benefit) of active bi-amping is the lack of a lossy, passive crossover network.
Adding a powered subwoofer and high-passing the mains would be closer to a true bi-amped system, and would absolutely dwarf passive bi-amping in its effectiveness at increasing the dynamic range and clarity of your system.
You will not increase the dynamic range or prevent low frequency signals from impacting the high frequency response, as in active bi-amping.
One of the main benefits(maybe THE main benefit) of active bi-amping is the lack of a lossy, passive crossover network.
Adding a powered subwoofer and high-passing the mains would be closer to a true bi-amped system, and would absolutely dwarf passive bi-amping in its effectiveness at increasing the dynamic range and clarity of your system.