I have a set of boston acoustics SL60 6.5" components that i wanna install, and when i was looking over the instructions it shows me 2 different ways of wiring them up. 1 way is the single input and the 2nd is the bi amp. Whats the difference between the two? Im running a jl audio 300/4 and also a set of alpine type r coaxials for the rear. How should i wire them up properly?