Amazon.com: Skar Audio SDR-8 D4 8" 700 Watt Max Power Dual 4 Ohm Car Subwoofer : Electronics
Amazon.com: Lanzar 8in Car Subwoofer Speaker - Black Non-Pressed Paper Cone, Stamped Steel Basket, 4 Ohm Impedance, 600 Watt Power and Rubber Suspension for Vehicle Audio Stereo Sound System - MAX8 (1 pack) : Electronics
Amazon.com: BXW-124 2400 Watt 12" Subwoofer 4+4 Ohm DVC Pro Car Audio Bass : Electronics
Amazon.com: Car Three-Way Speaker System - Pro 4 x 6 Inch 180W 4 Ohm Mid Tweeter Component Audio Sound Speakers For Car Stereo w/ 30 Oz Magnet Structure, 2” Mount Depth Fits
Amazon.com: Pyle Car Mid Bass Speaker System - Pro 5 Inch 200 Watt 4 Ohm Auto Mid-Bass Component Poly Woofer Audio Sound Speakers For Car Stereo w/ 30 Oz Magnet Structure, 2.2”
Amazon.com: 4" Car Sound Speaker (Pair) - Upgraded Blue Poly Injection Cone 2-Way 180 Watt Peak w/ Non-fatiguing Butyl Rubber Surround 110 - 20Khz Frequency Response 4 Ohm & 3/4" ASV Voice
Amazon.com: 6” x 8” Car Sound Speaker (Pair) - Upgraded Blue Poly Injection Cone 3-Way 360 Watts w/ Non-fatiguing Butyl Rubber Surround 70 - 20Khz Frequency Response 4 Ohm & 1" ASV
Amazon.com: Car Vehicle Subwoofer Audio Speaker - 6.5 Non-Pressed Paper Cone, Black Plastic Basket, Dual Voice Coil 4 Ohm Impedance, 600 Watt Power, Foam Surround for Vehicle Stereo Sound System - Pyle PLPW6D : Electronics
Amazon.com: Massive Audio HIPPOXL124 – 12 Inch Car Audio Subwoofer, High Performance Subwoofer for Cars, Trucks, Jeeps - 12" Subwoofer 2000 Watt RMS, 4000w MAX Dual 4 Ohm, 3 Inch Voice Coil. Sold Individually : Electronics