Have you pulled a woofer out yet? I pulled a non working RR on mine. Surprisingly it's a 2 ohm woofer! I bought 4 ohm woofers as replacements. They won't work with the X5 amp. Mine is also non DSP. Non nav and Business CD. The dash unit is basically a display unit. The speaker amp is located in the LR corner.

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'06 X5 3.0i - bought @143,123 miles (12/26/20)