Jeepbloke, check out a Fusion bass tube if you wanna save money as it has the amp built in. Just need to power the tube and feed it a signal from the HU. Not messy at all and good enough for most purposes. Also lookout for JL Audio tubes too as they will be used but you can get them cheap and they play well. 200 dollars at the most for either option and less if you are lucky.
I got Sound Proofing all over the car. Mine is a SQ system, not a SPL system. It has Time Alignment and Parametric Equalization in the HU itself to take care of what the speakers sing and a separate DSP to make sure they sing the same tune. Dont be fooled by the sub, it runs in a very relaxed state of tune. No doof -doof here.
The rear speakers are for the rear passengers as they cant listen to the sub all the time. Believe me, its gets tiring after sometime no matter how good the sub is. They are fitted in such a manner that they can breathe well. The crossover ensures that they dont produce bass, which is the sub,s job.They produce clean vocals, midbass and the tweeters have been equalized so as to meld in with the comp,s.
Its not a VN/VS Commodore, its got some self respect after all.