JBL P1224 Power Series 12" subwoofer with dual 4-ohm voice coils at Crutchfield
BOSS Audio Systems AR120DVC Armor Series 12 Inch Car Audio Subwoofer - 1600 Watts Max, Dual 4 Ohm Voice Coil, Sold Individually, For Truck, Boxes and Enclosures, Use With Amplifier - Walmart.com
12' Car Audio Speaker Subwoofer - 1600 Watt High Power Bass Surround Sound Stereo Subwoofer Speaker System - Non Press Paper Cone, 90 dB, 40 Ohm, 60 oz Magnet, 2 Inch 4 Layer Voice Coil - Pyle PLPW12D
Lanzar 12in Car Subwoofer Speaker - Black Non-Pressed Paper Cone, Stamped Steel Basket, Dual 4 Ohm Impedance, 1600 Watt Power and Foam Edge Suspension for Vehicle Audio Stereo Sound System - MAXP124D
Amazon.com: JBL Dual 12" Car Audio Ported Enclosure : Electronics
Audiopipe TXX-BDC2-12 12" 1600 Watt Car Audio 4 Ohm DVC Subwoofer Sub TXXBD12 | eBay
JBL PRX418S Passive, Unpowered PA Subwoofer Speaker (1600 Watts, 1x18")
JBL PRX418S 1600W 18 inch Passive Subwoofer | Sweetwater