Kimber Kable is an excellent choice for this application, due to the fact that they have the proper number (12,16) of individual SOLID core conductors with three different sizes! One cable can be terminated with three sets of banana plugs or spades with the smallest diameter conductors for the treble and largest for the bass and medium size for midrange. This way you dont have to run mutiple lengths of cable. I would search for a Kimber dealer in your area first and go from there.
Matt
Matt