Most people mount them here, more than enough room for even a fairly large crossover (I have the Polk Audio MMC-6500 and they are fairly big). On the passenger side though you have to take out the glovebox and undo the rail part on the left, has about 5 screws down it, very easy though.
The panel are held in by 3 screws each, arrows show them. I would of undone mine but my parents car is close so I can't open the door fully to get my screwdriver in there.
-Democracy must be something more than two wolves and a sheep voting on what to have for dinner.
James Bovard, Civil Libertarian (1994)
-Giving money and power to government is like giving whiskey and car keys to teenage boys.
P.J. O'Rourke, Civil Libertarian
-Government's view of the economy could be summed up in a few short Phrases: If it moves, tax it. If it keeps moving, regulate it. And if it stops moving, subsidize it.
Ronald Reagan (1986)