Perhaps you can explain then what you mean by zero EMF leakage that apparently happens without bi amping and what are the caused audible detriments and benefits?
I guess the most concise way to express it would be to say that EMF is the conversion of resonances in the woofer motor to voltage.
If this voltage is fed into the high pass filter, it will modulate the source signal to some degree, and will, after being filtered by the highpass network, be reproduced by the midrange driver.
Since this voltage is not a part of the source signal it will degrade the quality of upperbass/lower midrange reproduction to some degree.
How much depends on the speaker design, and will vary with the type of program material you feed it.
The audibility of the degradation would also depend on the quality of the lower midrange/upper bass reproduction capabilities of your speaker system.
Major flaws in this range, due to placement or speaker design will probably swamp the effects of EMF. (you can't hear a whisper in a hurricane)
Speakers that have very smooth response in this range, and are properly positioned in the room to minimize ringing and coloration in this range, might be audibly degraded by EMF.
Connecting the lowpass and highpass networks to separate amplifiers will completely remove EMF as a variable in the performance of the crossover network, since the networks will then be electrically disconnected and will not interact.
