Here is some picture of the adapter I made. It’s including RCA out and speaker wiring to all the speakers including the SUB. I also use a blue cable for Remote on. I’ve installed it on a BMW E91 with an Alpine PDX-5 and Earthquake SWS-8 sub. The installation was very easy. I used a 4 gauge cable from battery and ground cable. Everything else is connected by this adapter. Some people have complained about hiss for the PDX-5 amp. I can’t hear any hiss at all and I must say that the PDX-5 is working great in this setup. The next step would be to upgrade the OEM 4” midrange and tweeters
