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MHB Pa Subwoofer 14 31/32in(15 ") 8 Ohm 350 Watt 30 To 5000 Hz 94 DB 070036 | eBay
Amazon.com: Sound Town 15" 450W Raw Woofer Speaker with 4" Voice Coil, 100 oz Magnet, Replacement Woofer for PA/DJ Subwoofer, 8-ohm (STLF-1504-8) : Musical Instruments
15Hz Bass Test - YouTube
Amazon.com: HERTZ SPL Show Series SS-15-D2 SPL 15 in. (380mm) 1200 Watt RMS 2-Ohm DVC Subwoofer : Electronics