MTX JackHammer JH4512-04 Car Subwoofer - 12, 500 Watts Max, 125-250 RMS Power Range, Spider Plateau Venting Technology, (Refurb) at TigerDirect.com
Amazon.com: MTX TN12-04 12 Inch Single Voice Coil 400 Watt Car Audio Bass Subwoofer and Q Power 12 Inch Single Heavy Duty Vented Subwoofer Enclosure : Electronics