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If you don't want to go for an Alpine upgrade, just change the stock speakers with off the shelf ones you can find in any car stereo dealer. I did that in the rear. Big improvement!
I went for the Alpine upgrade, and new subs as well. Massive improvement!
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Current: 2018 X1 F48 & 2014 F20 116i. Before: 2009 BMW E90 320d LCI, 2008 E92 M3 &
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