completely useless thread, i know but i never found my answer when i searched! need just one quick answer. im about to order a HU (kenwood kdc-x494) from crutchfield so i can install my subs since i just got the truck. im pretty sure my 07 slt QC has the 4 speaker set-up, but what's the quickest way to tell? do the 7-speaker setup have the 'infinity' logo? i see three slots in the dash where it looks like speakers could be placed, but nothings there so is that where the other three would go if i had the 7 speakers? thanks guys

 

You should have a set of tweeters on the inside of the side mirrors where the trim piece is... I think. The holes in the dash are vent holes

 

tweeters would be up underneath the dash as you thought, and yes the infinity logo would be on the interior side of where your mirrors are. If you have no speakers under that piece up on the dash then you do not have the 7 speaker setup.

 

awesome, thanks