The size, the power of the bass, and the ability to put luggage on top!! It's also removable! If you want reliable bass, this is it!!

The TRTP woofer BOX is equipped with a ReFLEX™ passive woofer that is the same size as the KICKER CompRT woofer, delivering bass that exceeds its size.
Even if the woofer is placed downward, it will still produce the same bass sound as before, and luggage can be placed on top of the thin box, so it will not interfere with the cargo space.