X2 on the BSW speakers. I only used a pair to replace the blown midbass in the front of my X5, and it made a huge improvement. It's a bit of a proceedure to swap them as the stock midbass are glued in to their housing. You need to cut them out, and BSW provides new glue. Well worth the work.

Just from looking at the stock speakers, you can tell that some corners were cut. The cages are plastic. The BSW are strong metal. The BSW magnets are also much more substantial. The stock speakers did use a composite cone though very similar looking to the BSW.

A complete set of these BSW speakers to replace all the drivers in the X5 except sub costs less than a single pair or top quality component 6.5" midbass drivers with crossovers and tweeters. They are NOT a true audiophile solution. To do that, you definately need a quality amp with at least 300 watts, (another for the sub), and at least three times the cost of the BSW for speakers. Plus some fabrication work to deal with the wierd speaker mounting. Plus lots of wiring.

But the BSW are a big improvement over stock.

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2014 BMW 328i Xdrive
2011 BMW 335i M-Sport
2008 BMW X5 4.8i Sport
2000 BMW 528i 5sp