Is it important to use a terminator on a unused splitter output?
This really can depend on your system and the type of splitter that you are using. Here in Gainesville, we use terminators for three reasons: 1.) To prevent ingress from entering the system through an open port at the tap. 2.) To prevent signal reflections (which really isn’t too big of a problem). 3.) To prevent cable theft. Honestly, I doubt it would make much difference to have a terminator on a splitter in the home. If you want to do it anyway, you may be able to pick up a pack or something from Radio Shack. You cannot use the ones that cable companies use, because they require a special tool to install/remove them (prevent cable theft). Please see the definition for terminators for pictures of them.