I've been disillusioned with the sound of my bass for a while. I even started playing guitar for a while... 
But, today I was at ol' Sam Ash and I played an MTD Kingston Z5... And I realized what my Jazz was missing. It doesnt have that aggressive thump. I've heard jazzes get it, mine just doesn't. What is it? How do I acquire this magical trait?
My bass is a 2008 American Standard Jazz with and alder body and maple neck. Would adding a preamp help? Thanks in advance.

But, today I was at ol' Sam Ash and I played an MTD Kingston Z5... And I realized what my Jazz was missing. It doesnt have that aggressive thump. I've heard jazzes get it, mine just doesn't. What is it? How do I acquire this magical trait?
My bass is a 2008 American Standard Jazz with and alder body and maple neck. Would adding a preamp help? Thanks in advance.