How do I make my car audio system louder?

Hi2me4u

New member
I already have an 1800watt kenwood amp hooked up with two 10'' sony (i know, only temporary) subs to my 07 Jetta's factory speakers and stereo radio. How do I make the sound (not the bass) louder? I can already make the subs 10x louder than the speakers. Do I need new door speakers? A higher powered amp? Or a new head unit?
 
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