In the rear left there is a panel that provides access to some cabling. There are 2 units in the area, one says BOSE (in the photo, silver unit), and the other one unknown. What exactly does the silver unit do?

Also, the other unit could be the Jukebox hard drive that sits below the black bracketing underneath the BOSE unit?


Also, next to the spare tire there is another housing marked BOSE. Does anyone know what this is?