I listen to rock, metal and jazz in the car. So I was thinking, at first, two 10" subs...

But now I'm thinking what would be easy to wire, clean and sound good is a single 12" sub and a 5 channel amp. Doesn't have to be stupid as F loud, my goal is to not have something clunky that takes up all the trunk space. Or a single 10" sub, which I think will have a faster response for the kind of music I listen to.

Highs in the upper dash, mids in the doors (whatever fits BEHIND the panel, prob 5"?) and some 9" ovals in the rear deck under the tray. Good quality speakers rated higher than the amp.

I haven't built a "sounds system" in over 20 years and I'm more into the quality of the sound than the loudness (it just needs to drown the exhaust).