I very recently got the Rainbows for a standard stereo system on a 2006 X5. I must be honest I am not impressed at all. I really have noticed no improvement in the quality of the sound. In fact on some tracks, my musical tastes are varied and this relates to no specific genre of music, I found the speakers worse than the OEM.

I have no issue with BSW it was my choice I took the chance but I honestly wish I hadnt.