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Amazon.com: CERWIN Vega 600W Active Spare Tire Application Subwoofers Series (VPSTX12) : Electronics
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Awave AST-11TV4 11" active spare wheel subwoofer – SoundQuality.net
JBL Basspro Hub - 11" Spare Tire Powered Subwoofer System with 200W Amplifier, Black - Walmart.com
diy subwoofer spare wheel install | diyAudio
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Amazon.com: CERWIN Vega 600 watts Active Spare Tire Application Subwoofers Series (VPAS12ST) : Electronics
For those of you who want more bass but don't want to sacrifice your spare tire or hatch space, I highly recommend this spare tire mount subwoofer : r/GolfGTI