Amp remote power wiring on 2012 mdl 2

I have a amp installed and I'm using the stock Head Unit feeding it. I have converters from high to RCA in the dash to the amp. the remote power is turns on the amp on startup and not accessory mode. When the car turns off, the speakers pops. I am guessing even if the HU is not on it is still sending something to the amp, thus the pop from the speakers. I have a Polk PA660 amp. Is there a better way to supply the remote power to the amp to keep this from happening or a better way to wire this.