Just my opinion here, but I do not find the iGrados in the least bit trebly.
I do agree, the 225s do have some treble emphasis to them, which I do like.
Excessive? if you don't like it, then it's excessive.
But I personally dig that Grado sound!
Thanks for the link to the graphs, BTW.
I was surprised at how flat the 225 actually is!
And the iGrado looks like how it sounds!
How much burn=in is recommended for sr60i's and igrado's? What happens to the sound quality?