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How to make a subwoofer box louder!

  • This is a quick video on how to coat/seal the inside of your subwoofer box to gain SPL/DB for free! I used automotive rubberized undercoating I found at Autozone for around $7 a can. It is also used for sealing, rust prevention and sound deadening! It is night and day!

    Category : Alpine

    #how#subwoofer#box#louder

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