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make sure the amps filters is set for low pass and high pass. also make sure you have the gain, levels and bass boost are turned up..

if you get a shallow sub you can put them behind the back seats. you will need the sub = $80 - $160, an amp = $120 - 180. and all the wiring maybe $50 - 80 depending on the power you are looking...

You dont have to but as you know you will need an amp for the sub. once you have that get you a rca converter and tap in into you speaker. this is used if you dont want to change out the factory. if...