Passive bi-amping? No. Little to no benefit.
Active bi-amping with external crossovers? Possibly, but it requires 3 amps per speaker, disconnection of the internal crossovers and, of course, the external crossovers. If you want to do that, just get Seaton Sound Catalysts. Mark Seaton has already done all the work and the cost would likely be similar:
* Internally powered, tri-amplified design.
* Three (3) ICEpower channels of amplification with 24-bit/96kHz DSP executing the crossover design and response contouring.
* 300W powering the coaxial 1" Neodymium compression tweeter
* 700W powering the 8" midrange (coaxial with tweeter)
* 1000W powering the pair of 12" sealed woofers.
* Galvonic isolation of XLR inputs.http://www.seaton-sound-forum.com/post?id=3044980#1