With the Caliber BC112FA, all eyes are on you when you're driving in your car. This completely installed subwoofer produces a bass that'll make your windows shake. The 30-centimeter driver produces powerful bass tones, while the bass reflex port provides extra deep sounds. The casing contains a built-in amplifier, making it easy to connect it to your car's sound system. Keep in mind that the woofer's 44cm wide and 38.5cm tall, so you can only place it in the trunk.