+1 fiesta75! I have done that with an active x-over and four mono amps + four speakers (two for L/R mids/treble, two for L/R bass). The improvement in dynamic range and freedom from amp clipping was most noticeable!
My experience with bi-wiring
Not wanting to debate the issue, which has been done ad nauseum, I just wanted to share my experience in case it's of help to anyone else in a similar position. Originally I single wired my speakers with jumpers made from my speaker cable, but I had been curious about bi-wiring and read all I could both pro and con. The main thing I gathered was that it is a contentious subject that there is no consensus on. I was reluctant to spend the money on something that may not pan out, but as the maker of my speaker recommended bi-wiring, I finally decided to give it a try. I was impressed that there was a worthy improvement in detail/clarity across the frequency spectrum. Admittedly any change is speaker dependent and YMMV, but if your speaker brand advocates it, I suggest it's worth a try.