Having know a few local custom installers for over twenty five years, I've seen this same scenario more times that I can remember.
How to get a mono signal for whole house audio
I'm helping my sister plan for whole house audio in the house she's building. I asked the electrician to run 14/4 from the audio equipment to each volume control, then individual runs of 14/2 out to each speaker location. Yesterday I checked his work. He ran a single 14/2 cable from the equipment to the volume control, then a single 14/2 out to a speaker location, then out from there to the next speaker location in series. He wired for MONO instead of stereo! Drywallers are in there today sealing up the house. Bummer! How can I come up with a mono signal to feed this system. A local Guitar Center said I should use a Y connecting cable to combine the left and right preamp outs of the receiver to get mono. Will this work? Any ideas?