If you Bi-Amp a 4 ohm speaker = Ohms????

If you bi-amp a 4 ohm speaker what is the amp seeing? In other words is the non-bi-amped 4 ohms the result of two 2 ohm speaker sets in series, two 8 ohm speaker sets in parallel, or could it be anything? Or would the resulting resistence be 4 ohms on both the high and low pass? Or could it be all different combinations? Is there a way to tell? I plan on running the left signal on one amp, the right on another. If there is a difference between the high and low pass could that be a problem if the amp sees 2 ohms on the left (my low pass signal) and 8 ohms on the right (high pass)???? Also consider I have an active crossover before the amps so only the low signal will be seen by the left side of each amp, the high on the right. But I guess my main question is just what should I expect the amps to see once the 4 ohm speakers are bi-amped. Maybe it is a dumb question, I don't know.......

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