Try elitecaraudio.com there is a helpful forum section there. Also being in the business we call those Olds cutlass cierra's "The Nun" :) Happy motoring. ~Tim
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Sounds like subwoofer time. I'd say 10 inch drivers in a box with the 6X9's removed should do the trick. Check out www.sounddomain.com and submit your questions to their subwoofer forum section. Mention that you want sound quality instead of just SPL and they will answer regarding box size, crossover points, power needed etc.
Gumby, if you want to use the 4" Fostex, you can use that design that I posted awhile back, that uses the 4" PVC pipe as a T-Line. You can mount the "heads"( 90 degree "L" bends) right on your rear deck, with the speaker facing forwards, and use short sections of 4" pipe under the rear deck with bends connecting them to equal the 5 foot length you need, and bring the outlet of the port back up through the rear deck lid again. You could do this on both sides, and most of the pipe will be hidden under the deck. This T-Line is good down to the low 40's with the FE-103. SPL is limited, but sound is good. Also, price is cheap. No woodworking, and easy assembly. A small handful of pink insulation behind the driver is all the stuffing you need. Probably sound pretty good in a car, with the small area. Midrange peak can be tamed with a little "doping" of the paper cones. But, too much will cut the highs. Do one coat at a time, and listen each time. Cheap and easy,and should fit in your space requirements. Sounds like a plan. Why, because you're Gumby dammit! And a bendable plastic figure needs to have a bendable plastic speaker enclosure.
Gumby, what is it you are trying to accomplish with the rear speakers? Do ya want good bass or good bass with rear fill?
I got outa the car audio biz afew years back and have forgotten more than I remember but I do recall that there were very few drivers made that could produce any kind of realistic bass when loading was by means of the trunk.
Decent bass is much easier to obtain using an enclosure of some kind, be it sealed, vented, isobarik or what have you. By using the trunk as the enclosure your basically running the driver in freeair.
There are drivers specifically made for this application, but most of those are poorly designed.
I have heard a few systems considered high end in the auto world. I heard tight bass on the bottom end... but a huge hole between the midbass drivers and the subs. I have to fill that hole or I wont be happy. I need midbass.
I would even try "boxing" a good set of 6X9's under the deck.
I am waiting for the info on the right size for a sealed box for the 5.5" and 4" Stillwater drivers I have. This might solve the whole problem. I don't know.
I tried some stuff with the Fostex drivers I have been playing with. Not enough beef to overcome road noise.
The 3.5" in the dash have a 60 WPC amp crossed over @ 120, with great results. (Boatload of headroom) :)
If I could just get 200 and down dealt with, I would be a happy man.
I will say this however. My screwdrivers and soldering iron have been getting a fair amount of use and I am having more fun with this car project than I have had in years.
So much room for tweaking :)