I have seen an analysis in an E39, but I have never seen one done on an X5 or E38. I know for certain that the DSP amp in an X5 is coded with very different acoustics (crossover frequencies and internal equalization settings) than one coded for an E38 or E39. But, just for reference sake, here is a link to the frequency analysis done on an E39.

http://bimmer.roadfly.com/5series/me...w19/69562.html

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2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
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