Hey Dennyrex, To answer your question, I used a Lanzar Vector 8" Super Slim Active SubWoofer purchased thru Amazon, I believe Pyle makes a model that looks identical to it."added a self contained 8" powered sub behind the drivers seat"
curious which one you used.
In case this info helps, I wired fused power directly from the battery under the carpeting to it along with a ground cable and the blue remote turn on wire from the stereo. I also ran a pair or RCA cables from the sub outputs on my Pioneer AVH-P8400BH head Unit to its inputs and ran the sub control cable under seat to side of center console.
I replaced the 2 rear seat bolts with taller bolts and added washers so that the bolts do not allow the drivers seat to slide past the bolt, which works out perfectly so you can't smash the drivers seat into the sub-woofer by accident if you tried. I didn't miss the space at all, i never drove with my seat all the way back ever before I installed this.
Here are some pictures, and I intend to actually cover the entire sub with a thin black car carpeting I purchased with Velcro just so it isn't visible, I doubt that affects the sound at all, as it is only felt under 100Hz frequencies, really low bass. Most of the regular bass is heard from my rear 6x9 Pioneer speakers I installed in the rear hatch door.
If I had to do it over, I doubt I would go through so much trouble if I had the larger 6x9 speakers, and 4 speakers total, it's more than enough bass!
If you only have the 2 small 6.5" door speakers then yes, probably want a sub speaker also. And this powered 8 inch is much larger than the small one under the seat the car comes with.
Let me know if you have any more questions.
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