Amazon.com: Audiotek AT-AP100 1/2 Din Car Audio Digital Bass Processor & Sound Restoration, Crossover for Car Subwoofer Tuners w/Bass Knob Input 15V RMS and Maximum Output 13.5V Peak : Electronics
Amazon.com: HERTZ Mille Pro Series MP-250-D23 10 in. (250mm) 600 Watt RMS 2-Ohm DVC Subwoofer : Electronics
Amazon.com: HERTZ Mille Pro Shallow MPS 250 S2 Shallow 10 in. (250mm) 2Ω SVC Subwoofer incl. Grille : Electronics
Amazon.com: Planet Audio AC12D Car Subwoofer - 1800 Watts Maximum Power, 12 Inch, Dual 4 Ohm Voice Coil, Sold Individually : Electronics
Amazon.com: Sound Town 15" 450W Raw Woofer Speaker with 4" Voice Coil, 100 oz Magnet, Replacement Woofer for PA/DJ Subwoofer, 8-ohm (STLF-1504-8) : Musical Instruments