
This statement is a nitpick but I feel like I have to point it out. The O2 was designed from the ground up to be a neutral amp, and based on the testimonials of not only myself but of many respected Head-Fiers, I'd say that it succeeds admirably in this regard. I don't know if you like the O2 or not, but calling it bright is kind of doing it a disservice.
I hear slightly accentuated treble, so I used the word bright.




























The HD-650 is a tad warmer for sure.


