I love music and stock speakers could use a little upgrade for bass and that thump like a lexus580 does. I came across a website that has my interest at its highest- anyone have any experience with these speaker systems? pics posted below

 

Yes, I have Bavsound in my F56. It was an improvement over the stock HK speakers. However it really needs more power and really didn't shine until I added the power. My suggestion would be to add an amp first to the stock speakers and see what it sounds like, then add the Bavsounds if you think it needs it.

I used a JL Audio 6 channel amp and with that you lose the center channel dash speaker which is pretty useless to begin with.