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I have the Hi-Fi equiv on my X5 and from a non car audiophile that i am the difference is noticeable from the standard to hi-fi speakers, the audio is clearer than the standard. Also I did notice a diff with the HK system at high volume compared to the hi-fi but i don't crank up the music that loud so the extra grand went elsewhere and chose the 9 spk system. Also the other factor in my choice is that I listen more to talk radio than play music, and the hi-fi sound is great, the voices are very clear (maybe due to having tweeter speakers??)
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