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Kef LS series? TBH, I don't think the driver colour matters so much once you have a grill and it may be down to the material itself rather than a cosmetic choice. I'm also assuming that bigger versions would be more sensitive (e.g. as in most series, e.g. Kef R100: 86db; R300/500: 88db; R700:89db; R900: 90db).