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Dayton Audio DCS205-4 8" Classic Subwoofer 4 Ohm
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Bass Speaker 4 Ohm 150W Audio Music Woofer Loud Audiophiles Home Theater 6.5" 7341160649016 | eBay
Amazon.com: BLACK DIAMOND DIA-57.2 5x7 Coaxial Speaker Car Audio 2 Way 4-Ohm 150 Watts (2 Speakers) : Electronics