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Rob , I'm trying to attach a wiring diagram of my SPA 4 intercom system, not sure if this is coming thru.
I am just in the stages of installing the instrument panel and completing the wiring, nothing has been powered up yet. I can see where I would like to be able to control the volume of the AOA announcements to my headphones. A harness was prewired for me before I bought the Pro II AOA for my SPA interphone , an SL-40 and a garmin 496. Looking at the SPA4 diagram I'm thinking I should tie the Single shielded audio wire into the J1(3) blue wire going into the interphone. It looks like the J2(1) Green wire goes out to the tip of each headphone jack. The only switching I have is a Avionics Master switch. All the radios have their own on/ volume controls. Does this look correct?
Thanks
Ron
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