polarity

Been a while since I was here, I've moved back to Mississippi with my 370 and now it's time to start looking at sound options. I got the upgraded bose with the nav when I bought the car, little did I know that would be my downfall when deciding the stock sound was crap and I wanted more.

Now alot of you audio gurus have had a chance to check out the car in it's many forms, what would you guys suggest for upgrading sound. My biggest complaint right now would be that thing in the trunk they are calling a sub, as far as I can tell it's just a really pretty spare tire holder.

Since I use this as a DD I just cant bring myself to pull the spare tire, I have every type of insurence and road side assistance there is, but being stuck on the interstate at 5pm rush our traffic waiting 3 hours for the AAA guys to show up is not my idea of a good time.

I don't have a budget, but I do have a wife so try to be reasonable. I am not looking to win any competitions, just want some nice clean bass. In the Jeep I sold I just had 1 12" kicker with a 1200 watt amp, all the other speakers were replaced but no extra amps on them. That thing would rattle your head off. I'm looking for something about that strong, but cleaner hopefully. Any ideas would be appreciated.

I saw the zenclosure boxes and they look great, anyone got feedback on if you lose any of the little visibility you have from the rear window or if the box is low enough not to interfere.

Thanks
-William