i was bored one time so i played with a biampable crossover once, to me it doesn't make a difference at all, unless you're running two different amps, one for hi and one for low, but other than that, it doesn't make a difference...
you can just use one output.. i also tried the low output and the high output to see which one would sound better, and they both perform the same, the only difference is, the one that i use with hi input, it gets the sound quicker/faster than the low input..
they're great speaker.. i installed them in my father's car..
so i suggest if you're using just one two channel amp, just use one of the inputs, i prefer the high, but either one doesn't matter,
oh yea just remember the midbass/midrange is DVC... when i was playing with it last time, i thought the speaker was ****ed up, but i look and saw it was DVC so i connect both and now it works.. again if you wire it series or parallel, it doesn't make a difference (i think) well i wired mine in parallel tho..
good luck, just curios how much did you pay for that component, i paid $40 shipped for it, brand new with one year warranty =), that's why i think it's ****ing great speaker..