Hello, I have above mentioned active subwoofers http://www.amazon.de/…/B0002MNX4G and would like to install it now into my Volvo. I thought about that: 1. The device gets power from the rear battery 2. I grab the sound from the speakers of the D-pillar from 3. Mass in the rear area 3. Now I have to connect the device with something that is also switched on/off.. In this guide is http://www.pioneer.ch/en/products/25/130/TS-WX206A/media.html that the Ve I have no idea where to go with it. Can anyone help me there? Greetings to the accessories clamp to be manufactured in the safety unit of the vehicle should be placed over 2 amps.