Why does this Biwire set-up not work?

I recently purchased 2prs of Kimber monocle speaker cable with the intent of running them in a biwire configuration with my Krell 250m's.The amps have 2 sets of spkr posts perside for optional biwire setup.
I hooked the spkrs cables up and the sound wasn't right.
I spoke to kimber cable,they said the cables could be retermed at the amp end for biwire configuration
( both ends termed together at the amp end)
Why do both spkr cables need to be termed together
and ran from the same posts?
Thanks mike