Total posts : 45366
I am so relieved, rlkocher, that a reason was found for your audio trouble.
That is not something that would have easily been expected, so it is to the credit of the seller that he realized and admitted the reason for the problem.
What I think the builder should do in the future is label the inputs of his devices and describe the several varities in the documentation.
Receiving equipment with unanticipated mistakes is a natural hazard of working with specialized electronic equipment.
We had a factory new remote transmitter control unit installed in a rack, and one night there was a big bang and some smoke. It turns out the manufacturer had wired a large capacitor backwards and it blew up.