American Bass 15" Dual 4 Ohm Voice Coil 2400 Watt Subwoofer ELITE 1544 AB-Elite-1544 All Car Audio | 12 Volt & Beyond
Skar Audio EVL-65 D4 6.5" 400 Watt Max Power Dual 4 Ohm Car Subwoofer : Electronics
RX 12" 200W Single 4-Ohm Subwoofer – Stinger Electronics
Amazon.com: 10" Car Audio Speaker Subwoofer - 1000 Watt High Power Bass Surround Sound Stereo Subwoofer Speaker System - Non Press Paper Cone, 90 dB, 4 Ohm, 50 oz Magnet, 2 Inch
MESO-6-5 - 800 Watt Max 6.5 Inch Car Subwoofer - CT Sounds
Wiring Subwoofers — What's All This About Ohms?
Memphis Audio PRX1044 10" Power Reference Dual 4-Ohm Subwoofer
Massive Audio GTX Series 12-Inch 700-Watt-RMS Dual 4-Ohm Subwoofer in the Mobile Audio department at Lowes.com
Alpine S-A60M Mono Amplifier and a S-W10D4 S-Series 10" Dual 4-Ohm Subwoofer - Includes wire kit - Creative Audio