Dayton Audio HTS545HE-4 Kraken 21" High Excursion Subwoofer with 5" Voice Coil 4 Ohm
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Dayton Audio DVC310-88 12" DVC Series Subwoofer
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Tang Band W6-1139SIF 6-1/2" Paper Cone Subwoofer Speaker
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Dayton Audio 18" Ultimax Subwoofer and Cabinet Bundle