[gcwebbyuk]

I have this combination and am happy with the sound through my AudioEngine A2 speakers, but through the Grados I get a lot of sibilance.
 
The bass and midrange is good, and detail is very impressive, it's just the lisping on voices and very high notes.
 
Could I have duff Op-Amps - or is this just due to the sound of the Grados?

 

[gcwebbyuk]

Just swapped the two headphone Op/Amps back for the original ones, and the high end is still a bit splashy.
 
For instance - Rope by the Foo Fighters has a lot of cymbals which very very tinny.
 
Also there is a kind of lisp to Dave's voice.
 
Any ideas?

 

[gcwebbyuk]

I managed to fix the problem by switching back to the stock ear cups - I had been using the doughnut type ear cups.
 
This seems to have cut right down the harshness and sibilance - there is still some minor sibilance at high volume levels though, but only when very loud.