[Accord Man]

I hate bandpass', the only reason you'd go with one of those if you want more "noise" in your car.. You'll lose a lot a musicality.
With your hatch, you should already be getting good SPL..

Usually, its better to have divided chambers, but if you're satisfied with the quality of the sound, then its fine..

Take note that MTX subs arent exactly the cleanest sounding, so thats another thing to keep in mind.. Depending what type of music you listen to and what type of sound you're going for!