Hi, I heard a difference in the soundstage so yes, for me, it improved and I felt instruments or voices were better for it. I heard a subtle change to the treble, I'm not sure how to word it, errr, treble got clearer and more defined so I kind of hear the tsk tsk of a cymbal more clearly. Bass is still very good and so the SW24 didn't affect this in any negative way for me. I just find the whole sound is great. I don't know the audiophile lingo nor how to use the terms sorry. I feel I get more detail from the music too. Maybe this is the clearly defined treble or bass or whatever. Either way, I am loving it. Am listening to a brilliant bi-naural album now on the ZX2, "From the Mountaintop", now this is incredible on TRRS.