So, I'm trying to find circuit diagrams for a passive xover/summing circuit to drive a passive sub. Bsically, I want to run L/R channels off the amp through a xover to a sub and two satellites. I goggled for some circuits but came up short.All I need is basically a first order low pass (satellites are full range) but was having trouble figuring how do that without commoning the L/R channels for the satellites and effectively making everything mono.