I'm helping someone with their HT gear and they want me to install a Multi-Switch on their DirectTV system. They have 2 receivers now and they had the install guys run a third wire to a bedroom. They have a Terk 2-in/4-out MulitSwitch. The dish is on the side of the house at head-height with the 3 lines running from it. Looks simple enough. Here are my questions: A) The dish has a single "horn", but since they already have 2 receivers hooked up I am assuming this is a dual LNB system. I take the 2 wires feeding the 2 receivers and plug them into the inputs on the Terk MultiSwitch? Is it that simple? I thought I saw a diagram that showed different voltages on each of the 2 wires from the LNB. Is this something I have to worry about? B) I know about putting a terminating resistor on a CATV splitter to prevent reflections. Do I use one of these on the 4th output of the multi-switch? If not, what can I do to cover/protect that output? C) My Dish receiver has a "Check Switch" feature that I sometimes have to run. After hooking in the Multi-Switch, do I need to go to each receiver and perform any setup functions? (This is a DirectTV system). Any advice or links would be appreciated.