Have been doing a LOT of reading here. Great info, thanks to all that have posted. I have noticed multiple LOC's used to provide a full range signal to aftermarket amps. Why not simply twist the three front left + together and the three front left - together? Wouldn't those three together act as one channel into a line out converter? I am sure there is some reason this cannot be done, but none that I can think of...

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2004 BMW X5 3.0i - Mine
2011 BMW 328i xDrive - Hers
2002 BMW 325xi - waiting for a new owner