Prior to the amp in my e39 dying...it would make approx 9-10 high pitched beeps. It sounded similar to the "clean tape" warning that BMW used on many of their in-dash cassette tape/radio units during the late 70s to mid 90s. . Again, it was an electronic high pitched "beep, beep, beep, beep" and it would occur upon just about every start-up or when the audio system was turned on and it was always the same number of beeps.

Then one day, the music died (the amp).

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