Ah someone with a 96-00 caravan! Lucky you, I know just about everything there is to know about this vehicle's stereo system as I have a 96 grand caravan (no infinity), and I too have installed extra speakers in the doors and rear tweeter pods.
I disagree with the comment about not putting tweeters back there. I will admit the rear side 6x9s are in a horribly designed location and you'll be lucky if you get any bass out of them at all. You've probably noticed that it's kind of hard to hear much of anything coming from those speakers, when you're all the way up in the driver's seat.
The tweeters, however, CAN be heard from up at the drivers seat and you would be happy with the extra high frequency response they will add. Even though tweeters in the A-pillars would be more ideal, tweeters in the rear tweeter pods will still make the system sound better overall. Unless you're more concerned with the imaging and high frequency response for the passengers in the rear seat, you will like having tweeters there. They are at a pretty good height and as long as you aim them properly you'll like it.
Does your van have the rear A/C & heating system in it? If so, you may have a problem with the depth of the speaker you try to fit back there in the tweeter pods. An aftermarket set of tweeters will fit but anything bigger will require a lot of extra work and cutting of panels and stuff.
The infinity tweeters are 2.5" tweeters that fit into a black plastic mount that's attached to the inside of that body panel back there. Even in vehicles that did not come with the infinity system, there is wiring for speakers at all locations, including back there at the tweeter pods. Also, the black plastic mounts are also located there in all the vehicles.
I've never measured mine, but according to Scosche, the size of the cavity for the tweeters is 2.5" W x 2.5" H x 1 5/16" D. That's not a lot of room to work with and I can tell you from firsthand experience it is a pain. I was able to work on mine without removing that whole rear side panel, although it was stupid and in hindsight it probably would have been easier to just done it the right way.
You have to remove the plastic ceiling panel in order to pry out on the rear side panel because the side panel extends all the way to the ceiling, all as one piece. For the driver's side, you also have to take the jack out and remove two screws holding the panel in. For the passenger side, the seatbelt bolt near the ceiling has to be removed. Once you've done this, each panel should come out with a little prying--just spring clips holding it in at this point.
There will be plugs hidden behind one of those black plastic sticky insulation squares. One on each side of the car. Beware however that the factory plugs for the 6x9s have to be intact in order for the tweeter wiring to work properly. If when you installed the 6x9s you either used a speaker harness or just tapped into the plug and didn't cut it off then the tweeters should work just fine. If you DID cut the plug off, there should still be two extra wires around the 6x9 opening that need to be reconnected. This is because the tweeters are run in parallel with the 6x9s.
Your stereo system should probably be able to handle the extra speaker load, but start out with caution. I have all 8 speakers running off a single pioneer head unit with a mosfet 45 amp chip in it (pioneer says more than 2 pairs of speakers can be safely run off the single deck).
Just make sure if you do use a set of aftermarket tweeters, that they have some kind of crossover either built in or included with the wiring, because I'm pretty sure it's a full-range signal going to those tweeter pod wires.
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