This system can be done in a number of configurations, but this specific one comes loaded with the Kenwood Excellon 803-5, five channel amplifier that runs the front components, rear coaxial speakers and slim subwoofer that fits just above your front to back mounted under seat cabin heater.  The electronics fit in just to the inside, and this one is all set to connect to your house battery system so you can also enjoy the music while your van is parked!!!