Possible B&O system Co-ax outputs?

[BigMeatsBronco]

So while chopping my Bronco up and moving electronics outta the bed area (yes it has a bed now) I noticed on the B&O amp, a plug with four connections....

Immediately I thought ”I bet these are for co-ax low outputs”!

Never seen a connection plug quite this size and shape, but found it also interesting that the blue wire uses a USB connector plug.

Here's a pic.

Anyone have a test kit to see if these are indeed line outs?

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[Ksjrb03]

The blue wire is head unit to DSP connection. The other is a service port.