Originally Posted by x_25

The stock head unit has a built in EQ that hypes up the midbass and highs, and you can't turn it off. Odds are the sound won't change much. Though switching fromeven my aftermarket head unit to an amp has helped with the athority of the bass, but I think that may have to do with the stock speaker wireing being so thin that it is acting like part of a crossover. (If the resistance of the speaker wire is too high compaired to the nominal impedance of the speaker, you start getting dips in the freqency responce where the impedence of the drivers is highest).

Originally Posted by Fit4Spl

If you go with a double din the look is much cleaner vs a single din unit. And there are Double din units that are available that are not MONSTER priced. And even with the stock head unit being decently made it is still low quality compared to what you can get aftermarket. As for the sub, the fit has a TON of room in the hatch. You could easily put an 8" sub in a tube or a very small enclosure in the back and lose very minimal space. I built a box for a Sundown 8" that was just over 1 cuft (12x12x12 is a cubic foot) and it slammed in the car I put it in. So don't rule out a sub just because you have a baby. There are many ways to incorporate a sub and lose very little as far as hatch space. Some have even made enclosures that fit into the spare tire well while keeping the spare tire. So do a little searching in the ICE section.

Originally Posted by Fit4Spl

If you want anything under 100Hz in frequency then good luck, the stock size drivers just can't handle that and not many even aftermarket in the 6.5" arena can handle 100Hz and below. I've done car audio for over 25 years, is what you are saying possible, sure but it would take a ton of work and expensive gear. And if subs are a waste of space then you really do not like bass response, because a true subwoofer is required if you want true bass response. But each to their own!

But if you are just looking for decent overall sound then an external amp with components up front and coaxials in the rear should do just fine but don't expect any real bass response because it just isn't likely to happen.