you cant defeat the crossover unless you open up the speaker and take it out. hence bi-amping/bi-wiring will probably not do much for you. there are a lot of theories on these topics, but in my past i have talked directly to polk about things such as this and they told me bi-amping or bi-wiring is a waste of my time. i dont have lsis, but they are not too different than other polks (build wise). my only thought is that by running the lows through one amp and the highs through another amp you would get a little more separation than by having it combined. either way its going to get combined and then separated in the speaker though.