Planet Audio TQ12S 12 Inch Car Subwoofer - 1500 Watts Maximum Power, Single 4 Ohm Voice Coil, Sold Individually, Resonant Frequency 35 Hz, Sensitivity SPL (1W / 1m) 87.., By Brand Planet Audio - Walmart.com
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8-inch Aluminum Cone Subwoofer Speaker with 31Hz Resonant Frequency for sale – Raw speakers manufacturer from china (97756434).