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The 12 has more presence. It seems louder and boomier. I have a Diamond Audio D310 in currently on 400 watts rms. It plays low and loud and will hit pretty good. If you want something to fill in the low end of the stock system I think a 10 is sufficient. Mine will play with authority on all types of music and still provide enough "bump" for my tastes.
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2004 BMW X5 3.0i - Mine
2011 BMW 328i xDrive - Hers
2002 BMW 325xi - waiting for a new owner
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