Bi-amping with 2 2ch amps

The imput impedence of the X150 is 22 kohm balanced x2=44kohm I have the M5-HP set at 50 htz now. I would guess that it will be calculated at 88 htz so I would try 75 htz and 100 htz. What I meant to be asking was should I come out of the pre into the Xover and split the run right behind the xover or run a single cable into the xover near the amp then split right in front of the amp. If double biwireing gives a cleaner signal in speaker cable wouldn't it be true if I ran 2 interconnects from a split close to the pre, wouldn't that help the quality of signal? I'll have to check with some one to see if in fact I should use 88htz, you bring up a good question thanks.

Bob what are your thoughts on all this?

Bob, Vandersteen recommends taking the imput impedence ( 22 kohm) and doubling when running balanced = 44 kohm. When I split the cable coming from the xover to both channels is the xover seeing 44 kohm & 44kohm which would be the total 88 kohm for the amp, or are you saying the total will stay 44 kohm so each channel becomes 11 kohm x2(11 in 11 out balanced) =22 kohm x2( boyh channels) = 44kohm? The M5-HP can be set at 20k, 33k, 50k, 75k, 100k, 150k, 200k, 300k and 400k.