The Astell and Kern AK 120 sounds so amazingly pristine that I don't want to get rid of it, but it doesn't have enough power to drive my Sennheiser HD 650's well.
I'm wondering whether passing the audio through an external amplifier would degrade the amazing sound quality coming out of its dual DACs? (I don't know much about how the electronics work, so sorry if this sounds like a rube question.) If an external amplifier will not degrade the sound quality would something like this be suggested?: http://www.amazon.com/Output-Desktop-Headphone-Amplifier-Compatible/dp/B008J26ZL4/ref=pd_sim_e_1
Thank you very much for your time