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Review: Earthquake SWS-8xi (2-ohm) and Rockford Fosgate P300-2 - BMW M3 Forum (E90 E92)
BMW Earthquake SWS 8 E90 E92 Underseat Subwoofer Upgrade Install How To - YouTube
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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
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SWS-8Xi - Earthquake Shallow-Mount 8" Single 2 ohm Subwoofer
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