woofer

Is it practicle to just upgrade the "factory rear deck Sub" to get alittle better low-end sound? And or swap out the factory Amp for a more powerful one?

my 3.8 2010 genesis sedan is great in every way, except the sound system....Can't seem to get the specs on it from anywhere or anyone? The sub woofer seems very very subdued and there seems to be no way to make it louder... The treble is decent and mid range is decent but the bass is...