Hopefully someone else has experienced this and can point me in the right direction...

Last night, my stereo started acting up (no nav, but has DSP). While listening, it sounded like all of the high frequencies dropped off. The sub was still playing, but it sounded like nothing else was. After a couple of minutes, it went back to normal. This happened a couple more times, and I got fed up and turned it off.

This morning, I now have no sound at all. The display in the dash appears to be functioning normally, but it will not play any sound, regardless of the iput I choose.

Has my amp died?

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2001 E53 X5 4.4i Sport
Titanium Silver / Black
141k miles, and broken down more than it runs...

2002 E46M3 Convertible with 28k miles - DD