Well, I auditioned Gryphon and didn't like it with my Sonus Fabers. Of course they are a class below Diablo and probably it only reveals their limitations but overall the music sounded much more organic and, well... musical with 6900 than with Diablo. Sure Gryphon was more detailed and transparent than Mac but I didn't like the sound at all. Suprisingly it didn't rock - the sound was quick and speedy but it had no balls. It sounded thin and smallish. My big surprise as I expected Gryphon to excell in this areas.