Hello! I have to install a hi-fi system (and other optical toys) in front of me with my car (Volvo S40 II, 2005) because I still have it in my basement and I don’t want to sell it! So this thread could be good instead of a showcase product, for other people who want to build something in the direction. I will post all my activities gradually because I don’t have 5 days at a time! Available is: high-performance audio – that means e s is already an amplifier in the trunk of which I will tap off the signal and speaker cables As a second battery the old main battery is used, new one was installed on 10.3.2015, said old one has ~80% power to be installed: 1x 1kW RMS subwoofer from Hifonics 1x 125W RMS 4-channel amplifier with high input (Crunch MXB4200i) 1x 150W RMS 4-channel amplifier for boot speakers 1x 2kW power amplifier 1x 1F capacitor (possibly also 2F) 1x 2kW changer 1x second battery with separation relay 2x 300W 3-way trunk speaker (for parking spaces) The whole thing is built into the trunk in a modular structure in a trunk tray so that this plug & play is for the car (and possibly other cars). The whole part will then be 1m wide, 80-100cm long and max. 50cm high! Photos later on. Above all else: It may take until I post pictures and these will appear gradually! I am working full-time and therefore usually only have time on weekends! So please be patient, I hope the result can be seen!