My unit has no DC/DC either but the harness is worth it -the guy is good. But it's still a rats nest-trust me. Even with out the PS-there is a ton of wiring you really don't need:
1.RCA
2.Alpine thingie
3. Optical
Also you change the output from RCA to Optical and analaog (alpine thingie) no probs from the HU. So you dont really need to get that fancy. I mean at the end of the day -if it's about SQ -then it CDs/digital whatever -and then tweaking the output after the processor to get the best sound.
So you don't need to do anything.
I am doing optical + Alpine -it works fine.
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