Hi Warren,
That sounds like the go. There is nothing wrong with the JL Audio products. As you have seen from my thread, you really will need something to help sort out the EQ of the system.
I have used a number of free air subs over the years from manufacturers like Soundstream and Focal. An 8" in the parcel shelf should work just fine. Try to sound deaden and seal the parcel shelf as best you can.
Cheers.
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