Amazon.com: Alphasonik AS8DF 8 inch 600 Watts 4-Ohm Down Fire Shallow Mount Flat Enclosed Sub woofer for Tight Spaces in Cars and Trucks, Slim Thin Loaded Subwoofer Air Tight Sealed Bass Enclosure :
Amazon.com: Facmogu 2PCS 8 Inch Full Range Audio Speakers, RMS 50W Peak 120W 4 Ohm, Car Vehicle Audio Full Range Drivers, Wide Range Bass Woofer DIY Loudspeaker Replacement - Yellow : Electronics
BMW X5, 1-, 3-, 5-, 7- Series -»FLAT-Line« WOOFER system - Jehnert Sound Design Automotive
Boss 10 Inch 800W Shallow Slim Car Audio Subwoofer Power Sub Woofer Flat D10F 791489108492 | eBay
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Shallow Series Subwoofer | Pioneer Middle East - Car Stereo, Car Subwoofer, Amplifier
BOSS D10F 10" 3200W Car Slim/Flat Audio Subwoofers Subs Shallow Woofers - Walmart.com