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Are you using at least one of the passive x-overs on the 3-way set up front? Otherwise how are you doing a 3-way active x-over off the arc amp? Are you feeding the internal MS-8 amp to the tweets?
At one point I had tried putting 8" subs behind the seats, the problem I had was the size of the basket hitting on the top and bottom of the cutout. I had made 3/4" MDF boards to replace the steel ones that the original 6.5" subs are mounted on. I'm sure there are some 8" subs out there with smaller baskets, I just didn't pursue it any further.
The downfall to the 8" on the 3/4" board is that the stock speaker covers will not fit. I had also dynamat and silicone sealed the factory locations, it really cut down on some annoying ringing.
I'm honestly still tempted to rip it all out and just port some 10"s from the trunk into the cabin area through the factory speaker locations behind the seat. I just haven't gathered up the stones to cut holes in the sheet metal to feed the ports through.
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