Before you do all this does the OE system provide for a line out. I know is many cases speaker out also works but I am not one subscribes to this view. that said...
1. Value for moeny nothing beats a Pioneer 306C in a 1 cu.ft. sealed box powered by a sony 502. Total should be 7K.
2. a good 12" in a sealed box would work as the easiest solution to proviude thump. Of course with bigger budgets and more space you can all the thump you desire.
3. 1 cu. ft. is about hte smallest box you can get away with. There are smaller subs but they wont give you a lot of thump. Hertz makes a 8" sub that works in about 1/2 cu. ft. for example.
4. I would NOT recommend a car sub for home use. It will not blow anythig up but (a) the car amp needs 12V DC so you'd need a 12V/40A DC source at home (b) car subs are tuned to work in cars. Homes are a different envrioment. (there is more but it gets technical). Suffice to say that you will get bass if you use your car sub at home (after all the woofer will flap around) but you wont get party level bass or quality bass.
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