Here's the diagram:
The source devices have line output 3.5mm stereo jacks and the Extron Audio Switcher has 3.5mm stereo input jacks.
However, the Extron Audio Switcher output jacks are:
Left (+, -)
GND
Right (+, -)
The manual discusses balanced versus unbalanced audio. Which should I be using?
After the audio switch I'm installing a 10k/100k dual-gang audio potentiometer for volume control. I think I know how to wire this but I'm not certain.
Finally, my audio amplifier (JBL DA4002, car amplifier) has RCA input jacks labeled "Pre-amp Line Level Input" but it also has 4 terminals labeled "Floating Ground Speaker Input."
Which should I be using?
Sorry for the questions and I greatly appreciate any help at all!