All depends on the crossovers, how the all thing is put togheter, but i think you should not run your amps the way you're describing. Much better would be if you run your amps as mono for lows and highs, if you connect one chanel for lows and the other for highs, don't forget there is crosstalk on each stereo unit, power supply and other factors. Question about impedance would be best resolved by contacting manufacturer of the speakers.
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.......