Thread: Standard speakers upgraded to OEM Top Hifi (retrofit)
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      10-29-2013, 04:41 PM   #63
fung0001
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Drives: f10 2013 520i Hartge Tuning
Join Date: Sep 2013
Location: hk

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What is the meaning of 4-channel amp?i suppose this mean amp for 2 front speakers and 2 rear speakers.
Sorry for such stupid question
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