I felt that the stock speakers were too sloppy. I have only replaced the front speakers (kept stock dash mid), but the front is a lot tighter. The tweeters are too bright, but this may be a result of running a 4 ohm tweeter vs. the stock 8 ohm.

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