Are you confusing "sibilance" and "stridence" by any chance? They are often confused by folks. Sibilance is when things sound "lispy," with over-accentuated "sssss" sounds or even "ss" sounds that sound like "th" instead. Stridence is when treble/upper-mids peaks are too piercing and painful. Anyway, if you're talking about sibilance, this is nice to know (i.e. that a better cable will eliminate the sibilance issue), and makes me possibly reconsider the M4U 1 instead of the Sony MDR-1A. . .the main reason, sound-wise, I was planning to get the MDR-1A instead, is because of the sibilance I heard when testing the M4U 1. On the other hand, the MDR-1A is still FAR better than the M4U 1 in terms of build, portability, and comfort. . .and portability is very important to me right now. So I'm still not sure what I'll choose in the end.