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I recently had these speakers installed in my F56 JCW. Installer built a sub box in the rear boot. They left HK center and strangely used rear HK tweeter with the Coax.
They used Ghost woofers I had bought a few years ago for mid bass. Very powerful. Sounds good. I would rate bass quality a 9/10 and vocals/instruments 7/10 and can play very loud with NO distortion. Previous HK bass was 2/10 (even with Ghost) and vocals/instruments was 6/10 but distorted badly above medium volume.
So I am a little disappointed in vocal sound quality compared to my Porsche Burmester ribbon tweeters for the $4,600 this install cost, but overall a significant improvement as I do like to listen at high SPL and that wasn't possible before.