Amazon.com: AudioPipe TXX-BDC4-15D 15 Inch 2,800 Watt High Performance Powerful Dual 2 Ohm DVC Vehicle Car Audio Subwoofer Speaker System, Black : Electronics
Amazon.com: DS18 SLC12S Car Subwoofer Audio Speaker - 12" in. Paper Glass Fiber Cone, Black Steel Basket, Single Voice Coil 4 Ohm Impedance, 500W MAX Power and Foam Surround for Vehicle Stereo
Amazon.com: Orion Subwoofer Competition RMS Power Dual Voice Coil 4" high Temp Voice Coil - Single Speaker Car Stereo Bass Woofer (HCCA152, 15 Inch - Dual 2 Ohm) : Electronics
Amazon.com: MB Quart RK1-168 Reference Car Speakers (Black, Pair) – 5x7-6x8 Inch Coaxial Speaker System, 200 Watt, 2-Way Car Audio, 4 OHMS (Grills Not Included) : 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: Skar Audio ZVX-18v2 D2 18" 3200 Watt Max Power Dual 2 Ohm SPL Car Subwoofer : Electronics