I have an Avic NEC-7100 installed in my motorhome and it's working great in general I really like it. The problem I'm having is maybe I don't understand how the rear output works. No matter what I select nothing seems to come out of it. I'm trying to connect just a regular aux cable out of it into a speaker that I can put outside and then here the music when we're tailgating but nothing I do seems to make any output come out of the rear channel (I'm trying mirror)

Anyone know how to do this?

What are you trying to output to the rear? Audio or Video?

First confirm that both rear audio and video connections are made

Second, what did you select as your Rear Audio/ Video source?

Pretty nice feature

As above, I'd like to mirror the source (often USB, but sometimes SIRIUS) to the rear output that I have connected to a cable which goes to the outside speakers (amplified). So it's audio only not video. Is this possible? I set rear source to mirror, the only thing I have hooked up is the cable form the rear audio output to the speaker, nothing comes out of it.