So I used to install my power amplifier in my C4 and have to say it was easier than I thought. First of all I got a fuse from my Citroen dealer for the already lying power cable. (2,30 €) After that to home safety set cable under the steering wheel measured and yes it is 12V. Then it went to the rear speakers because I wanted to pick up my audio signal for the high low level adapter. The damned plastic claddings were really torture but not like in other The car manufacturers are lucky to keep the holding ibble at Citroen when you remove it. So both sides dismantled adapters to the first speaker and with extension the other cable from the speaker opposite and connected as well. Then Stromabel snapped and placed from front to back under this plastic strip on the driver’s door and then under the back seat in the trunk. The mass cable made me worry about something there under the claddings in the trunk There was no screw to clamp in between to get on the body. Luckily under the plastic cover on the trunk lock there were already holes there I could then still attach my cable. I then simply got the remote signal over the ignition plus on the radio just bent up the clamp a bit and pushed over it. To guess is that I completely left all Citroen specific adapters so that a reset is no problem. xtrem was simple and not as stressful as in some BMW ́s. The only worry is now only the power cable, which was already from Citroen. It’s not necessarily the thickest. So far, however, only the rear boxes are connected and before I install a subwoofer I will put in front of the power cable still a capacitor think that will create the 2.5 sqm cable then. MfG Z01dberg