I am building a new house which I wired for audio myself using in wall 4 conductor wire. In many of the rooms I looped through a box and back up to the ceiling mounted speakers. In the loop I plan to install a volume control. I just realized that when I hookup the volume control I need to know which feed comes from the amp and which feed goes to the speakers.
Is there an easy way to deremine this without having to hookup speakers in the loop to determine which end comes from the amplifier and which end simply feeds up to the speakers. I have a multimeter and a 12 volt test light; however I really do not want to blow anything up. Please let me know if anyone has any ideas. Thanks a million.