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      03-24-2013, 10:56 AM   #19
ctuna
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Drives: 325xi 06 wagon MT
Join Date: Jan 2010
Location: Santa Cruz, Ca

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The output of the head unit only has 4 channels

The output of the head unit only has 4 channels.
If you bought a Technic Harness it should take care of that as far as wiring is concerned I think.
The under seat channels , for bass ,are generated of the front channels
through the amp .