'Andy Whittle from Rogers suggested to me that the screw-on-backs were probably the reason they sound so good. Screwing instead of gluing the backs makes for a lossier cabinet, something that is very desirable. Harwood also reported in his BBC technical paper on the development of the cabinet for the LS3/5 that a pair with faulty gluing between the fillets and cabinet walls sounded and measured outstandingly well (he published the measurements). But he added that, unfortunately, it wasn't possibly to make speakers with consistently bad gluing!
'So there's my hypothesis: the differences in LS3/5As are the result of variation in cabinet manufacturing. Wouldn't it be interesting to see if there was any correlation between the cabinet manufacturer used and the rated performance?'
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