In the case of the reference cables, it seems that way. There is a bigger difference if you go up to the Ref XL and bypass the ref with XL. You will not be disappointed.
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I agree with above. I brought home a pair of reference with XL technology to compare to my reference. I could not discern much of a difference at all. IMHO the reference and ultra with xl technology is a lot of marketing hype. I have not yet brought home the reference XL which is a different beast altogether according to my dealer.