Are the Polk's 2 Ohm? I had installed a set of Diamond Audio in my first X5, but blew one due to the mismatched load. I was looking at the Polks for the current X.

Did the Polks fit the tube with no modification?

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2004 BMW X5 3.0i - Mine
2011 BMW 328i xDrive - Hers
2002 BMW 325xi - waiting for a new owner