Interesting. I found them to be not as strong in bass as I'd like, and they are not harsh on the high end without the muffled sounding effect of lack of high end response. Usually I've found that without spending many hundreds of $$ makers try to add high end sparkle to their product to make it sound "better". I guess I am very sensitive to a bright high end, as I find that very hard to listen to for any significant time - this includes speakers as well for me. I've been recommending the X10s when asked. I also find them to be the most comfortable IEMs I've ever used. We are all different I guess.