OK I've got the power supply situation taken care of. I've got step down converters for both 5V (DA converter) and 3.3V (Airport Express) and a relay to switch the power supply on/off with the remote signal from the head unit.
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Mobridge DA2 > JBL MS-8 > ARC XDi 600/4 > JBL Gti 408 Mids & Vifa OT19 Tweeters; PG Ti2 1600.5 > Morel HCW-10 & IDMax 15
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