tweeters, sub woofers

I have a Grand Cherokee with a small system consisting of 2 dash tweeters, 4 after market door speakers, 1 subwoofer, and an Apine headunit. I am thinking about putting 2 additional tweeters on the liftgate pillars to raise the soundfield in the back seats. Would this be a good idea? Also, I am building a new enclosure for the sub so it is more concealed, when do you mount the sub the magnet outside the box, and when would you mount it so the magnet is inside the box?

As for the tweeters in the rear? Don't do it, it will destroy your image, rather than "lift" it. If you want to raise the image for the rear seat only, a pair high in the door, angled BACKWARDS (so as to affect the front minimally) will do far more, with the least damage.

Magnet in or out, ZERO difference, except volume displaced within the enclosure. Magnet in, you build the cabinet larger to allow for it's displacement. Magnet out, you can build the box a tiny bit smaller, as the cone is now out, and actually adds to the internal volume.

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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

what about ports? When do you need to make a port and when don't you? To clear things up up really would like an MTX thunderform enclosure that fits behind the spare tire in the cargo area, however they are outrageously expensive so I am going to build my own out of fiberglass.

Also, thanks for the tweeter know how, I will consider the way you suggested. I think I know the perfect place for them on the doors, and wiring will be a lot easier too!

It's going to depend on the woofer you choose... EVERY woofer will have an optimal alignment, be it vented or sealed. Which woofer are you considering?

Check here... This page will tell you the EBP of your woofer.

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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

It is just a Rockford Fosgate 10" Punch series 2 sub.

while I've got you responding, my headunit has a crossover and the amps for the door speakers and subwoofer have crossovers as well. I am kinda thinking that the crossovers on the amps are a little better quality than the one in the headunit, what do you think?

Here is my setup:
Alpine 9855 headunit connected to a Alpine 4 channel amp for the doors and tweeters (i think it is 40W per channel), and an JL Audio mono block amp for the sub (it is either 120W, or 200W) - not a big system by any means, but it can put out let me tell you.

I am trying to go for the most well rounded sound quality in all sitting positions.

The 9855 is a pretty nice piece, but the amps may be more flexible... Which woofer EXACTLY do you have? There are several woofers on the RF site.

Got it. Those woofers have an EBP of 82.6 WAY into vented territory!

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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

reciever: Alpine 9855
Sub: Rockford Fosgate P2D210
Sub Amp: JL Audio e1200
Speaker Amp: MRP-F250

I saw when I looked up my sub that it is best in a vented box. Any more suggestions about how to get the best sound?