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I have a 99 Jeep Wrangler stock radio - want to add a subwoofer tube. Is this possible? Recommendations? - tube car radio

Radio is just a band, nothing complicated. (I take no eyes of the thieves) I want a U-tube can be removed easily add boot if you questionable to park somewhere. No need through the window at the passing cars fly. We just need a better sound. I have a Jensen amplifier, the other vehicle, but I do not know if it works? How do I know what I need? All brands at low prices go?