QPower QPF15 Deluxe 15 Inch 2200 Watt 4 Ohm DVC Car Audio Subwoofer Subs, Pair - Walmart.com
Q POWER 15 in. Single Heavy-Duty Vented Square Subwoofer Sub Enclosure Box HD115-VENT-SQ - The Home Depot
QPower (2) 15" 2200W Deluxe Series DVC Subwoofers + Dual 15" Vented Port Sub Box - Walmart.com
Amazon.com: Q Power QBASS 15 Inch Heavy Duty MDF Car Audio Stereo Speakers Subwoofer Sub Box Enclosure with Dual Vented Chamber and Charcoal Carpet : Electronics