That is a nice background. Ive been looking for something like that since I'm not done tweaking my UI.

I have a very similar install in my RSX (1st gen N7 with autodroid), and I'm using the same exact DAC and had the loud pop whenever DAC turned on before/at the same time as the amp.

In my case I've fixed it by delaying the power on signal to the amp a few seconds using one of these.

I've also used the (yellow in my case) constant 12v 'memory' wire for power from the harness to charge the N7 controlled by another timer+relay via the normal key switched 12v. That allowed me to delay power getting cut to the charger during that half way key turn and when I turn off the car cause I dint like the "going to sleep" timer popping up all the time.