You would firstly have to get a REALLY BIG door, as the sub will require the space for the bass.
If the car is equiped with a subwoofer it is located in the rear cargo area under the floor panel right inside the rear tail gate.
You can typically install the subwoofer in the trunk of your car, and position it accordingly to get the sound you want. You can direct it towards the interior of the seat but do not keep it too close to the seat as you might damage the subwoofer. For a more detailed guide, visit http://www.ehow.com/how_3682_install-subwoofers-car.html
OEM Rear BOSE Subwoofer is best for Porsche
The instructions to install a car audio subwoofer can be found in the manual or the easy way is online. Online you will able to find the information related to the situation.
the back dor
As the name implies, it is the door which is on the right side of the car and the rear-most door, if there is more than one on that side.
what kind of car is it
Install a subwoofer, amp, aftermarket speakers, and a head unit. Possibly, the easiest way to get the best out of your car audio system is to upgrade the speakers.
It's not a rear facing car seat... only forward facing
Try opening a rear door then using the central locking button on the dashboard before exiting the car by the rear door
MAIN AMPLIFIER LOCATION: I found the main amplifier (not the small subwoofer amp) of my 2001 RR HSE located between the subwoofer and the outer body panel of the car. (If you had X-ray vision you would look through the subwoofer and see it behind) 1 - Remove the subwoofer 2 - Remove the CD changer 3 - Remove the metal brackets that hold the subwoofer / changer 4 - Remove the interior panel that goes from the rear seat to the tail light (was blocked by the subwoofer) 5 - Remove the sound insulation fabric 6 - The amp is located directly between where the subwoofer was, and the exterior of the car. Thanks to the person who finally posted the correct location. The main amplifier (not the small subwoofer amp) on a 2001 RR HSE is NOT located below the glove box, it is NOT located below either seat, it is NOT located in a door panel.
The same as it does to install a regular one provided the car came with. Suicide doors stock