two subs are not always better than one. nor would 2 smaller drivers always be better than one larger one... a smaller driver typically does not have the frequency response of a larger driver (given same quality with both), if you had 1 or 1000 small drivers it still wouldnt go as low as one bigger one. now if you switched from 1 big crappy driver to 2 small but better drivers then there will be a difference, but it will not be a difference of low end extension. a lot of people like bass that is not really low, in fact what they consider bass is mostly midrange, so you must be getting more of that sound from your 2 5.25s and that is what you like...

------------------
This post has been brought to you by curegeorg, thanks for reading.