I just got a pair of HD600 for Christmas and have been thoroughly enjoying them, except for one little thing. I have been noticing a tinny buzzy/crackly sound in my left ear. I only notice it during quiet technical sections of old (1960's and earlier) recordings. I have been listening to everything (classical, rock, movies...) trying to decide if it is a problem with my headphones or just due to the old recordings technology/conversion to modern digital formats.
Flac->Foobar->ASIO->Asus STX Essence (high gain +12dB)->HD600
Anyone else experience a similar thing?