Originally Posted by prone2phone
if my headphones stress some high end, then i wouldn't mind some amp which stresses a low end. not a audio purist.
What I'm saying is, it may not be your headphones. In fact, it doesn't sound like your headphones if you hear it with every phone you try, and with different player/sources.
Have you listened to anything other than Diana Krall's "S'Wonderful" to look for sibilance? Do you hear it on every song on just on Diana Krall?
It's not a matter of being an audio purist. I just think that, in the long run, you'd end up happier with something that is relatively faithful to the source. I mean, Diana Krall will sound much less sibilant or not sibilant at all on your standard car radio. Is that the quality of sound you want to end up with?
Speaking from experience, the Mustang P-51 is a great amp. I don't know if I would describe it a "warm," but a warm amp is not going take away sibilance from a recording that has sibilance in the recording. You might be able to find an amp that takes sibilance away from some sibilant recordings, and it will almost certainly sound pretty bad on all of your other recordings, i.e., as bad as a car radio. Any good amp is not going to help you though; a good amp is going to reveal what the recording actually sounds like.
Anyway, I don't know if this helps; I'm just trying to help you identify what the problem really is so you pursue the right solution for the long run.
P.S. BTW, I've done what you're trying to do more or less. Many years ago, I had a favorite song that was sibilant, although I didn't know what sibilance was at the time. I ended up choosing a pair of headphones that reduced sibilance for this song the most, rejecting several Sennheiser phones as alternatives, only to find out later how much I was missing due to my selection of poor quality phones that happened to make one particular song sound good.