Alpine - SPC-600G7 Subwoofer System for VW Golf 7, Golf 6 and others
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Subwoofer Installation Guide
Tuning your subs
HOW TO WIRE A SUBWOOFER AND AMPLIFIER GTI MARK 6 2011 - YouTube
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500W Subwoofer System | Stealth GTI
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tomzz Audio 4057-006 Speaker Installation Set Compatible with VW Golf 4 5 6 7 Polo Passat Up Amarok Jetta Lupo EOS 165 mm Coaxial System TA16.5-Pro: Amazon.de: Electronics & Photo
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VW MKV GTi/R32/Rabbit 10" & 8" Perfect Fit ™Subwoofer Enclosure Install By Audio Integrations - YouTube