Mthieme, the two sets of wires are fed from you amp in parallel and not line level at all. Use zip cord as an example or a model since it is easy to see the two sides or + and - conductors to understand what is going on. Hook up two sets of zip speaker wire together,(both of the(2) + conductors and both of the (2)- conductors)using one SET of speaker connections at the amp end. Now for each speaker or channel you have 2+ and 2- conductors going to the speakers from the joined connection on the amp. The speakers need to have the two sets of input connections for Bi-wireing. Hook those to the (2)+ terminals and the (2)- terminals (on a bi-wire capable speaker) to each speaker. That's the hook up. I won't get into why to do it. Some will tell you not to bother. Use your ears and do what sounds best to you. I bi-wire my speakers and like it.
help with biwiring
I've been trying to figure out how biwiring works, I understand two duplicate amplified channels are feeding the upper and lower sections on the speaker, but where do you get two left or right line levels to amplify separately? Is the signal simply split into two wires between the preamp outputs and the amp. Basic question, I know, but sometimes they stump me the worst.