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BMW X5 EarthQuake SWS Subwoofer upgrade - YouTube
E92 Audio Upgrade Phase 3 - Install Earthquake SWS-8X Subwoofers - BMW 3-Series (E90 E92) Forum
Anyone added a subwoofer to a Harmon Kardon system in a F30? - BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST
