Car audio woofers are speaker drivers designed primarily to reproduce low-frequency sounds in a car audio system. They are usually mounted in an enclosure in the trunk or behind the rear seat in a sedan or SUV, or in the rear cargo area in a wagon or hatchback.

Woofers come in various sizes, with the most popular ones ranging from 8 inches to 15 inches in diameter. They are classified by their impedance (Ohms), sensitivity (dB), and power handling (watts). Some popular brands of car audio woofers include JL Audio, Kicker, Alpine, Rockford Fosgate, and Memphis Audio.