those DSP amps aren't cheap either...do you have a good salvage yard or 10 nearby to search for the proper DSP amp. A 5-series amps will work, but you have to get them recoded by someone with a DIS as the adjustments are all wrong for the X5 if the amp came from a 5-series (E39 M5's all had DSP).

If it is toast, you might want to just go aftermarket, but that's not cheap either...nor is it simple with DSP vehicles <sigh>

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Kirk
Las Vegas
2016 X5 40e Mineral White/Black Dakota Leather, ZLL, ZCW, ZDA, ZDB, ZPP, multi contour seats, rear side window shades, HK stereo
2011 E90M3, 6-speed manual