The LS 100 is not a balanced design, because this is achieved by our LS 36.5. Based on feedback from dealers and distributors however, we will likely make one set of the Main outs XLR, so that balanced cables can be used between the LS 100 and KWA 100.
Because of the unique input configuration of the KWA 100 (as well as KWA 150), both XLR inputs and RCA inputs are transformer input coupled (Lundahl) and thus RCA G is common to XLR -. As such, by making XLR jacks on the LS 100, even though not fully balanced, balanced cables may be used and the effect will be the same as using RCA's.
If unclear, please don't hesitate to ask me.