A good subwoofer fills in the low bass that door speakers can't reproduce, making music feel fuller at any volume. Our subwoofers are grouped by size, from compact 8 inch through 10, 12 and 15 inch, plus shallow-mount subs for tight spaces, powered and under-seat subs with a built-in amp, loaded enclosures, empty boxes and subwoofer cable.

Brands include Hertz, JBL, Pioneer, Kenwood, Infinity, DS18, Kicker, Focal, Rockford Fosgate, JVC, MB Quart, Black Diamond, Boss Audio, Alpine and SoundStream. If you want simple bass with a factory stereo, a powered sub is the easiest option. For more output, pair a passive sub with a suitable enclosure and monoblock amplifier, matching RMS power and impedance across the system.