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Subwoofers and equalizers can radically change your system sound without emptying your wallet - YouTube
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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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Amazon.com: OSD iDSP Subwoofer EQ and Room Tuning Kit, iPhone Android App Control, 2V Amplified Output, Including RCA Cables : Electronics
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