I just found this thread, so sorry to bring it back to life..
I recently got my W3s and I'm loving them. I do get a little sibilance with certain tips though. I can/do live with it, but once you learn about it / hear it, it's hard to unhear it, lol.
Here's an overview of the included tips, from my standpoint (I can get a good seal with all the styles, assuming the correct size):
-Clear silicon - The most sibilance, for me. The bass is a little weak.
-Black silicon - A little less sibilance. A little better bass. I don't know what it's called, but these have amazing left/right separation for me too. Much much better than any other included tips... it sounds on some tracks like the sound is coming from outside my ears, whereas the other tips sound like the phones are squirting the music into my head, if that makes sense. I've been using these tips because of this effect and the fact that I feel they are best balanced for me (except the sibilance) in terms of the good bass, mids, treble, and comfort.
-Comply tips - Great midrange, the treble sounds nice and natural, reduced/almost nonexistent sibilance, but noticeably reduced bass and isolation.
-Triple flanges (modded to slightly shorten stalk) - Absolutely no sibilance. Significantly increased bass - the most of any tip without question. Midrange also increased. These really kill the treble though. I like a bright speaker, so this was unacceptable to me. When A/B'ing them with the other tips, I really preferred the other tips' sound even with the sibilance. Although, I will say I did like the bass of these the most of any tip. I was using these for a while as I thought they sounded best initially, but they would get itchy and uncomfortable after a while. When I switched to other tips for comfort that's when I noticed the sound difference in the treble area. Couldn't be more night/day. I wasn't surprised they removed the sibilance, because all treble was noticeably muted vs the other tips, particularly the clear and black silicones.
-Triple flanges (modded to remove the smallest flange (also with same shortened stalk)) - This brought the sibilance right back and also removed the bass that I was liking. Essentially, this made these tips sound almost exactly like the black silicon tips, only without as much of the crazy left/right "outside my ears" separation. After removing the last flange, I then shortened the stalk to be flush with the bottom flange, and this made the sound even closer to the black silicon tips. The sound is nearly identical now, and the fit and comfort are also very close. I think the black tips edge them out in both areas, so I've been using them.
I'm very interested to hear from people who have had similar experiences but also own the UM56 tips. I'm sort of interested in buying some, but I'm curious which tips they will sound most like. I would hate to pay all that money and go through the trouble, only to find out that I still prefer the black silicon tips. My ideal tip would be pretty much the exact sound of the black silicon tips, but without the sibilance and possibly with a little bit more bass (if we're talking ideal).
I also plan to try the black olives (medium I guess since I used medium for all the other tips), but I'm hesitant to spend the $20 (or more if I end up trying both small and medium), wondering if I'll even like the results better than the black silicons.
Soo.. anyone try the UM56 tips after having sibilance issues with the included tips?
Those of you who tried the black olives that cured the sibilance... what size black olives did you use, and which size of the included clear/black silicon tips were you using -- is there a correlation between the two as far as size?