QS216
Speaker, Tweeter and Crossover Placement Options:
Factory sound systems vary greatly. Some systems have coaxials (tweeter fixed in the center of the midrange) in the door, while others have factory component (tweeter is separate from midrange) systems. If your system has the factory component offering then you will want to locate your factory tweeter mounting location and compare it to the diagram below. Some vehicles already have the tweeter in the ideal location, while others often position the tweeter in the top corner of the door pane which is less than ideal. A good rule of thumb is to try and mount the tweeter within 8 inches of the midrange woofer for optimal imaging and tonal balance. When selecting an optimal mounting location, ensure that you are clear of any obstructions within the door. Cutting or drilling into moving parts or electrical accessory wires can be very dangerous and costly.
Woofers should typically be installed in the factory locations. Simply ensure that the new woofer will not obstruct the window or other moving parts in the door.
The Crossover should NEVER be mounted in the shell of the door. This can damage the crossover through vibration and moisture which is NOT covered under warranty. The Crossover can be mounted in a kick panel, under a seat or in the trunk as long as the area is not located near any moving parts in the vehicle which could cut or pull the wires resulting in a short circuit.
All wiring to and from the crossover should avoid all moving parts in the vehicle which could potentially damage the wiring. Take great care when running wires through the door frame and into the door as wires can easily be cut. A rubber grommet should be used on both holes and wire loom should be wrapped around the exposed wires as shown in the diagram below.
Alternate Tweeter
Location
Ideal Tweeter 
Location
Mid Bass
Crossover
Route speaker wires through rubber grommet between door jam and door as shown. Use wire loom to protect the wires.
