Yep the Focal Speakers were £250 ish and I had an amp already
But if you said to them - WCA - could you do me a £550 upgrade same as the old BMW alpine , they might be able to help - I call this stage one.
I think I paid £450 but then note I already had the AMP - Ebay has millions of unwanted amps being sold by total anoraks who want the latest.
It is so much worth it - Definately worth spending £500 - £600 to start with and under a £1000 will prob add mental bass under the seats. Which I might add.
ALWAYS keep bass INSIDE a car... or it unbalances the sound. In the f10 you want to keep it "hi fi" BMW ish
BTW they fixed my issue... FREE!!!!!!!! OMG!!!!!! It was a setting.. nice quiet gongs now.