Mine has a business system. No DSP. I'll have to plug it into another door to check its operation. I do need to reinstall a fixed OEM LF regulator. The Chinese one has worked well but it's too slow. I can check that speaker's resistance on that door woofer. I too thought they were 4 ohm. It's why I accepted the speakers. I did try the 4 ohm speaker. At full fade rear and right, it barely cracks a sound. It's why I suspect bad wiring or radio output. The entire panel was not taken off. I couldn't figure out how to get the shade screen off. It seems to be under the small window pillar.

Thanks dazzasgotav8. I can cut the cone leaving the metal ring attached. The ring gives a mounting point.

What is the actually speaker size? The new ones are 5-1/4" 2-way speakers. The brackets provided do fit OEM mounting holes. However, the panel does not fit properly. Fitting a new speaker into the OEM mount is better.

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