Anyone ever attempt to mod IEMs to tame shrillness/sibilance? I have some S4s and generally like them EXCEPT on the occasions when the highs turn into bloated noise. Reading some reviews, I noticed that some IEMs have foam inside. And this got me thinking that something like this might help S4s. I didn't have any foam handy, but tried a piece of very thin silk -- held in place by the tips. This was a little too much, but was interesting experiment.
Anyone ever try things like this? Have any suggestions?