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Helix PP50DSP Plug and Play digital signal processor with built-in 5-channel amplifier at Crutchfield
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Volkswagen Genuine Option HELIX Plug And Play Sound System | Built in AMP Sub Woofer Speakers | Croooober
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Helix Soundbox Upgrade Information Post! | GOLFMK7 - VW GTI MKVII Forum / VW Golf R Forum / VW Golf MKVII Forum
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