I think I hear the HD800's peak as much higher... in the 6KHz region, which made it splashy and sibilant, but not shrill. The Rag exhibited weirdness in the 4-5KHz region as much as I heard on the HE-560, which is shrillness to me, so I thought that was weird. But it might have just been me. In most cases, if this is done right, I can imagine it will act as a pretty good "sharpening filter" and give extra definition, though resolution is still more in the 10KHz+ domain.

10KHz and above generally to me is just piercing if there is resonance, otherwise it acts like a good high-pitch peak that works almost like "extended treble" to me. The SR-009 and HD800 definitely exhibits this behavior.

I think tiredness may also come as a side effect of some UERM units having more emphasis in the 2-4KHz region. This is where I hear "upper midrange" for the most part, and it's the region where shrillness can happen the most.

I think tiredness may also come as a side effect of some UERM units having more emphasis in the 2-4KHz region. This is where I hear "upper midrange" for the most part, and it's the region where shrillness can happen the most.

The UERM is a bit laid back in the 2-4k area. With a tone generator I hear a slight dip there, followed by a small rise at 5k. Rin's measurements seem to confirm this as well.

gracias

What do you think about iFi idsd micro?

At least it was better than that shitstorm that Lhlabs did for any < insert any product that's not the geek out >.  Thanks to that most head fiers have sworn off crowd sourcing.