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Originally Posted by DouglasABaker
There is a question as to whether the factory radio module can drive a speaker load. I would say the answer is "Not for very long" since speaker impedance is so much lower than amplifier impedance (and therefore higher current which will fry the radio unit circuit). Having said that, I've never tried. And for clarity, I am referring specifically to the radio unit mounted in the trunk.
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Both the in-dash radio and the navigation board monitor radio are designed to drive the speakers directly. BMW uses the same radio in all three configurations of the audio system. That is probably the reason for the high voltage output. The radio is designed to serve a low impedance, high current load.
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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
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