American Bass XO 10" Subwoofer Dual 4 Ohm Voice Coil, 300 Watts RMS/600 Watts Max, 90 oz Magnet
Car Speaker Subwoofers 600 Watt 8/12/15 Audio Subwoofer 4 Ohm Speakers Subwoofer Car Audio - China High Power Subwoofers and 15 Inch Subwoofer price | Made-in-China.com
New Rockford Fosgate P3sd4-10 10-inch 600 Watt Car Audio Shallow Mount Subwoofer P3sd410 (4 Pack) : Target
Pyle Power Series Dual-Voice-Coil 4Ω Subwoofer (6.5", 600 Watts) in the Mobile Audio department at Lowes.com
Amazon.com: BOSS Audio Systems CXX8 8 Inch Car Subwoofer - 600 Watts Maximum Power, Single 4 Ohm Voice Coil, Easy Mounting, Sold Individually : Everything Else