My friend worked as a repair tech at a local hi fi store and examined the crossovers in some Rogers LS3/5A's. He noticed differences between early and later ones. Sonically I heard NO difference!
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I don't remember seeing a difference in the KEF B110 woofers used in the LS3/5A's. They were supposed to be selected and matched per pair. My tech friend said that the earlier versions used an autoformer in the x-overs. As regards sonic differences years ago Hi Fi News did a comparative survey of various versions (Rogers, Chartwell, Goodmans, etc). You might want to check it out - I found it fascinating reading! BTW I own a later production pair made by Rogers.