Sony XA-39

The Sony XA-39 is/was a RCA switch - two sets of inputs (connects to 2 head units) and one set of outputs (connects to amp(s)) that was controlled by the amp remote turn on outputs of the HUs.

It doesn't provide an AUX in as such, but can allow you to pipe another source through to the amplifier(s). No good if you're running the speakers off the HU.

/Michael
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/Michael