JL Audio 10TW3-D4 Shallow-mount 10" subwoofer with dual 4-ohm voice coils at Crutchfield
Amazon.com: Massive Audio UFO10, 10 Inch Shallow Subwoofer - High Powered 600 Watt Shallow Mount Subwoofer, (3 Inch Voice Coil Dual 4 Ohm) Low Profile Car Subwoofer with Deep Bass. Sold Individually : Electronics
Amazon.com: (2) Skar Audio VD-10 D2 10" 800W Max Power Dual 2 Ohm Shallow Mount Subwoofers, Pair of 2, Model:(2) VD-10 D2 : Electronics
B2 Audio RIOT FL10 (Shallow Mount) - Sky High Car Audio