VW Retrofit LTD - Golf MK7 TDI upgraded with Helix subwoofer kit. 2h ish job including fitting and programming sound parameters. Quite good results from such a small box 😊 | Facebook
Option soundupgrade V2 compatible with VW Golf 7 VII - 100% plug & play complete system with 5-channel DSP amplifier, 25 cm downfiring subwoofer - 400 Watt RMS: Amazon.de: Electronics & Photo
subwoofer upgrade Fender Audio | Page 5 | GOLFMK7 - VW GTI MKVII Forum / VW Golf R Forum / VW Golf MKVII Forum
Replaced dynaudio sub driver - Modifying your Golf R MK7 - VWROC - VW R Owners Club
Alpine - SPC-600G7 Subwoofer System for VW Golf 7, Golf 6 and others
Subwoofer installieren im VW Golf 7 | Tutorial | ARS24 on Vimeo