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      01-28-2013, 06:23 PM   #17
ctuna
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Drives: 325xi 06 wagon MT
Join Date: Jan 2010
Location: Santa Cruz, Ca

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Maybe you could use your iphone as a meter.
See if it gets louder when the iphone is in different locations in
the car.

I thought equalization and signal levels for the Hi Fi amp were
taken care of in the Head Unit and there were only analog connections to the Hi Fi amp. If anything it looks like the newer one might be more likely to have data connections.

If the new Hi Fi amp had data connections and you put it into an older car without data connections in the harness of any type I could see how this would be the case.

This also might be why some of the people that retrofit to the new radio are having sound level problems with the old Hi Fi amp
and the New Head Unit retrofit. (its a speculation only )

Last edited by ctuna; 01-28-2013 at 07:12 PM.