I have searched the forum and found some information on this topic. But none that address my specific question/problem.
My company just had a professional music on hold message created. It was sent to me in MP3 format. I can play it on the player just fine with the earphones that came with the player and it “loops” by using the repeat function of the player. However, when I plug in our MOH cable from the phone system I can’t hear anything through the phone system. When I plug that same cable into a standard earphone jack on a portable radio it works just fine. Any ideas?
The only thing I can come up with in my own speculation is that, in order to preserve battery life, the voltage/impedence of a modern MP3 player does not match the voltage/impedence requirements of an old-fashioned earphone. The only other difference I can think of is the MOH cable is mono. But since the professional recording is not in stereo (it has identical content in both channels), then I would think plugging a mono cable into it would not be a problem.