biamping with a arc 150.2 and vtl mb125

Hi, guys,
i own a pair of vtl mb125 mono blocks. i wanted to bi-amp using tthe vtls for mids and highs and the arc 150.2 for the bottom end only. my speakers are 88db efficiency, so they suck power.. i am afraid of the input sensitivity between the amps. since i will be using the 150.2 for bass only, will the sound be cohesive?? am i doing the right thing. i cannot sell my vtls, i will not give them away, so i was wondering how this match would work..any help,please??
thanks