Even if the woofers were the same (I'm sure they are not), the tweeters are two completely different tweeters. Which means the crossovers need to be redesigned (not tweaked, redesigned). It may "work" but I am positive you won't be in the same league as the actual 805d. FWIW, I would suspect that $800 each won't buy you a pair of diamond tweeters. I know that companies like accuton want about $5800 for the pair. B&W's are not that expensive, but I'm sure they are quite pricey.
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