Massive Audio GTX Series 6-Inch 250-Watt-RMS Dual 4-Ohm Subwoofer in the Mobile Audio department at Lowes.com
6.5 Inch Car Mid-range Speakers 100w 4 Ohm Grey Injection Cone Woofer Loudspeaker Gtx 1660 New I Key Buy - Speakers - AliExpress
MASSIVE AUDIO GTX 104 1400 Watt 10" inch Dual 4 Ohm GTX Car Audio Subwoofer Sub! 623169610882 | eBay
Amazon.com: Massive Audio GTX124 – 12 Inch Car Audio Subwoofer, High Performance Subwoofer for Cars, Trucks, Jeeps - 12" Subwoofer 700 Watt RMS, 1400w MAX Dual 2 Ohm, 2.5 Inch Voice Coil. Sold Individually : Electronics
Amazon.com: Blaupunkt 8-Inch Single Voice Coil Subwoofer with 400W Power : Electronics
Massive Audio TKO Series TKO104 10" 600 Watt Dual 4 Ohm Subwoofer | Massive audio, Subwoofer, Audio
1x Gravity 8 Inch 1000 Watt Car Audio Subwoofer w/ 4 Ohm DVC Power 8' Sub Single – ASA College: Florida
6.5 Inch 165mm Car Woofer Subwoofer Powerful Speakers RMS 100W 8 Ohm Big Magnet Paper Cone
Amazon.com: Gravity 1x 8 Inch 1000 Watt Car Audio Subwoofer w/ 4 Ohm DVC Power 8' Sub Single - Feature Dual Voice Coil, Thick Magnet, Design for Car, ATV, Van, High Performance