Portable boombox turned Subwoofer in a car.

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Hey, I am thinking of making a portable boombox that will turn into a bass booster in a car once connected, Im not looking for a lot of bass, just a little boost. I am not sure if this is possible and if I am able to do this with one amp. I would make the boombox and in the car I would run the subwoofer output from my cars radio into the boombox and connect it through the RCA connectors, and I could probably run a cable for power so I could charge up the battery in the boombox.
I am really new to audio and I am not sure how I would go about doing this, I found a cheap amp on amazon Lepai LP-168HA 2.1 and I thought this would be perfect.
Does anyone have any help or objections about this? I need to know if this is even possible.
 
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