I can't wait to listen to both!
I fixed the pop:
A 5 Volt Fixed Voltage Regulator (Radio Shack #276-1770) did the trick. You carefully solder and heat shrink three wires onto the little beastie - there is a diagram on the back of the package. You have +12volt power and ground, and the third pin is 5 volt output. Solder and heat-shirink all connections, but the lowdown is the regulator's ground hooks up to the head unit's black ground wire and then you solder the Blue/White (or blue on some stereos) amp/accessory turn on wire that comes out of the headunit onto the regulator's 12V input, then solder the 5V output wire to your aftermarket adapter amp turn on wires (blue/white).
I also discovered that the Metra adapter harness with RCA plugs combines the shaker 1000 sub amp turn on wire and the front door woofer turn on wire. I thought I was going to need two regulators (one for front amps and one for sub trunk amps) but one did the trick. I'll post pics later.








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