Harsh trebles? No way with the hd-25.
Headphone Reviews and Discussion - Head-Fi.org
vTL123
I actually agree with the harsh trebles and the emphasized bass; it does get fatiguing very quickly! Suppose that's what the volume knob is for 
extrabigmehdi
Regarding the treble lacking smoothness / being grainy , things improves a bit by switching to velour pad.
You'd be happy also to have a slightly weaker bass.
You'd be happy also to have a slightly weaker bass.
purrin
Might need to try with be velour pads. Senn came out with new cup design that tames the treble resonances: http://www.innerfidelity.com/content/most-excellent-sennheiser-amperior-and-hd-25-1-ii-page-2
Only thing that sucks is that this "corrected" edition is $350, which is how the headphone should have come in the first place. As for bass, this thing has more bass than the V-Moda M80 and Beyer DT1350. Just a tad too much for my tastes because I'm not really a basshead.
Only thing that sucks is that this "corrected" edition is $350, which is how the headphone should have come in the first place. As for bass, this thing has more bass than the V-Moda M80 and Beyer DT1350. Just a tad too much for my tastes because I'm not really a basshead.
extrabigmehdi
There's a big controversy regarding the innerfidelity review. Don't forget that he compared the regular hd25 with pleather vs amperior with velour (see first comment). The difference in measurements are not that big .
And even some sennheiser rep, said that the intent was with amperior, to reproduce same sound, with lower impedance, and improved materials. So no, it's a bad plan to get amperior, if you want improved sq, imho.
And even some sennheiser rep, said that the intent was with amperior, to reproduce same sound, with lower impedance, and improved materials. So no, it's a bad plan to get amperior, if you want improved sq, imho.
purrin
I'm fairly sure that my source doesn't cause excessive resonances at 6k and 12kHz. ssss sssssss ssss ssss sss 
Maybe the headphone is defective. 
Maybe the headphone is defective.
extrabigmehdi
You could try to listen to one side at time (left or right).
If there's a big difference between left & right then you have a defective driver.
If there's a big difference between left & right then you have a defective driver.
GL1TCH3D
I'm not a fan of the hd25 either... I got my gf a pair and my friend got some m50s. The m50s sound much better to me.
Though, the m50s were burned in a lot more and the hd25 were fresh out of the box so I'll try again later...
Though, the m50s were burned in a lot more and the hd25 were fresh out of the box so I'll try again later...
And about the treble being an assault to ears, I don't get it too.
I can hear treble up to 18khz , so I don't think my hearing is that bad.
I'm wondering if we are listening to the same headphone. Might be a problem with your source.