So I just got my alpine 9857 headunit, and wasnt thinking about getting components or subs yet since i think the unit itself will offer enough but i think i will want more bass. My car is a DD so putting a subwoofer box in the trunk is out of the question since i need the space. I have read the rsx oem subwoofer does very little but just might be what i am looking for. Would it be possible to mount 2 of the oem rsx subwoofers in the rear panel? how would i power them and how much powere. if i were to get polk momo components for the front, what kind of amp/ power should i get also to power all 4 speakers. Also im trying to keep the cost low but still be able to get decent sound out of what im looking for. If you have recommendations for other low price decent components, amps, subs please let me know.

Thanks

John