Guys, I think this is just the matter of taste if you like this high trebles or not, I personally don't like them because a guitar speaker doesn't have these either.
so for me the XTC is the perfect choice for all rock guitar sounds:
[media]https://www.soundcloud.com/gui…rofiles-of-the-bognar-xtc[media/]
but for some metal sounds you prefer the 5xx0:
[media]https://www.soundcloud.com/gui…-profiles-of-the-pvy-5xx0[media/]
but the XTC is Not muffled at all it just has another characte, that's all
I agree - I listed to them one more time and definitely they are not muffled. Less hight frequencies then on the others, but it is a matter of personal taste. I edited my previous post so that future readers won't get incorrect understanding that the profiles are bad.