DS18 ZR15.4D 15" Car Subwoofer with 1500 Watts Dvc 4-Ohm
Pyle PLPW15D 15" 8000W Car Subwoofer Audio Power Subs Woofers DVC 4 Ohm, 2 Pack - Walmart.com
JL Audio 15W0v3-4 W0v3 Series 15" 4-ohm subwoofer at Crutchfield
Amazon.com: 15" Subwoofer 1000W Single 4 Ohm Bass Pro Car Audio American Bass DX-15 : Electronics
Orion XTR154D Package | XTR 15 Inch 3000W Dual 4 Ohm Subwoofer & Ported Sub Box | eBay
American Bass XO 1544 15 Inch 400w RMS DVC 4 Ohm Subwoofer - SSA STORE
Lanzar Maxp124d Max Pro Compact 15 Inch Round 2000 Watt Powerful Performance Dual 4 Ohm Vehicle Truck Car Subwoofer Audio System (single Subwoofer) : Target