Can someone please tell me the depth of the 4" speakers in the X5? I have the base sound system and want to replace them with something that will fit. I understand that there is not much room behind the doors.

And yes, I will be powering them with an aftermarket amp.

Thanks in advance to anyone who can provide this information.

__________________
2009 X5 3.0 Space Gray, Black Interior, Sport, Premium, Technology, Cold Weather, Rear Climate, Sirius, iPod.