SDR-18 | 18" 1,200 Watt Max Power Car Subwoofer | Skar Audio
Amazon.com: Polk Audio PSW10 10" Powered Subwoofer – Power Port Technology, Up to 100 Watts, Big Bass in Compact Design, Easy Setup with Home Theater Systems, Timbre-Matched with Monitor & T-series Polk
Skar Audio Dual 15" 2,500 Watt EVL Series Subwoofer Package - Includes 15-Inch Dual 4 Ohm Subwoofers in Ported Box - Walmart.com
Sundown Audio SAv3 8" inch DVC Dual 4 Ohm (SA Series) Car Subwoofer 500 Watts RMS
Polk Audio HTS 12 Ported Subwoofer Review | Audioholics
Amazon.com: BESTISAN Powered Subwoofer, 6.5" Active Home Audio Subwoofer in Compact Design,LFE & Stereo Line Inputs & Audio Output, Built-in Amplifier for Home Theater/Receiver/TV/Speakers, Black, SW65D : Everything Else