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MT21A Built-in DSP single 21" Self-powered Subwoofer with Compact Cabinet Box - Buy 21" subwoofer, single 21 inch subwoofer, self powered subwoofer Product on Sanway Professional Audio Equipment Co., Ltd.
Rockville SBG1128 12" 600 Watt Passive Pro DJ Subwoofer, MDF Cabinet/Pole Mount