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Old 02-25-2013, 11:07 PM   #10
opti
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Join Date: Mar 2012
Location: USA
Posts: 35
My Ride: 2004 330xi
Quote:
Originally Posted by markusmarkus View Post
The oem amp needs balanced differential inputs, not speaker level signals. Line level signal won't work either. I replaced my oem amp with a JL 400/4 amp that accepts balanced differential inputs. Worx fine.
The stock amp accepts speaker level, it's a straight shot from an aftermarket head unit to the bmw amp.
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