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Harmon Kardon System, '97 M3



Hi folks,

I think that I've lost the "extra" feature of the Harmon-Kardon system in my 
'97 M3. Flicking that little console switch on and off makes no apparent 
difference. Now maybe it's just my dumb old ears...can anyone suggest a 
technical check that I can run to see if the system is working properly ? 
Thanks in advance, Doug  C.,  Reno, NV.

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