Do you have DSP or the standard system? Is the nav a retrofit or was it factory?

This may be a system problem. I have my nav volume set pretty low on the SETTINGS menu, and it is still pretty loud. If I turn mine up, it is louder than the radio and blows me out of the car.

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SOLD
2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input