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Subwoofers and equalizers can radically change your system sound without emptying your wallet - YouTube
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Trevoce Triple 12" Active Subwoofer w/ App Controlled DSP, Native EQ Faux Leather, Black Series | Outdoor Speaker Depot
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Elac Debut S10EQ 10 Inch 400W Powered Subwoofer with App Control/Auto EQ-DS10EQ1-BK | Steiner's Audio Video
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7-Band Car Audio Graphic Equalizer EQ w/Front, Rear/Frequency Adjustable Subwoofer Output, Woofer 4 Channel and Enhanced Bass Output - Walmart.com
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