Ok farkle wizards. A different twist to my sound improvement quest.
Wiring is in to have a working female audio plug in the tank side box. It feeds off the connection for the "rear speakers" and it work loud and clear in headphones. I have a Bluetooth transmitter dongle ((eForCity Universal Bluetooth Transmitter with 3.5 mm Audio Cable) but I can't seem to get it to pair with my SMH10. I cleared all pairings on both units and tried to pair with the SMH10 multi connections and with the phone connections. Nothing seems to work.