If you are looking to use four speakers in a cabin of a vehicle,
IE - a set in the front and a set for rear fill

Is it a bad idea to use 2 sets of components??
(Ie one in the kicks/doors and one in the rear area)
If it is cool to try, where would you mount the second set of tweetS???
Perhaps use two sets of mids and only one set of tweets would work betteR?
OR
Would one set and a set of co-axials be a better idea for imaging, etc?

If the comps arent all the same (IE two DIFFERENT sets) would it sound strange or affect SQ?

Just tryin to decide if I should run my comps in the 'actual' front stage and then some 6x9s or something in the back...

 

For rear fill, it totally depends on the customer and what they want. I happen to like rear fill, if I were to compete that would be something different. I like to match speakers front and rear for tone and timbre, this means identical speakers if possible. This usually does not happen for most customers, so we use components up front and either a pointsource or coax in the rear. The most important speakers in the vehicle are the front ones, concentrate on them first with the proper mounting location and sound deadening if applicable.