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If you have option M490 (subwoofers in doors) the best way to do this is to replace your 4x40 amp with a 6x40 amp from a 996/911 cabrio and connect the rear speakers to the amp ... rather than directly to your CDR radio.
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Kent Christensen
Albuquerque
2001 Boxster
2007 GL320 CDI, 2010 CL550
2 BMW motorcycles
Last edited by lkchris; 04-19-2017 at 11:01 AM.
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