I'm going with this...
To be used with the camera kit. Just run the USB to the trunk and into the dac and toslink into my Helix p-dsp.
iPhone 5s (iTunes library/iTunes radio/Waze, etc) to Airport Express via AirPlay to Tru Technology SSLD6i via aux out of Airport Express to Helix A4S Competition. Dynaudio MD102, Esotar 1200, and MW152. Jehnert Door Cards and mid-bass'.