Thanks for the answers guys. A friend of mine na medyo may konting alam sa car audio said yung stock speakers ko may treble and mid naman, and recommended that I just get an amp and a single 12" sub. Sayang naman daw yung speakers ko, ok pa naman daw. Talagang mahina lang ang bass.

Does this make sense? Is this just a matter of getting the hardware he told me I should get? Thanks again peeps.