I have the Logitech Z-5450 speakers and they work fine except the rear speakers interfere with my wifi network and wireless phones. I want to use a separate amp and different speakers for the rear sound. To do that I need to solder in a rear line out from the control pod but I can't figure out where to solder in the wires. I already cut the wire for the antenna so the control pod cannot send any RF signals. I need either a circuit diagram of the control pod's PCB or just tell me where to solder in the wires. Please help.