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Car Subwoofer, Clear Sound Speaker System Active Subwoofer Enclosure 20HZ-150HZ with Control Line for Truck for Tractor : Amazon.co.uk: Electronics & Photo
Crown 300W 12" Karaoke Woofer Speaker with Max 8 Ohms Impedance, 20Hz- – JG Superstore
Hot Selling RMS 1500W Car Audio Speaker 15 Inch & 12 Inch Auto Stereo Subwoofer 20Hz-150Hz Sound Trumpet - China 15inch Subwoofer, Car Subwoofer | Made-in-China.com