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With a good powerful amp, they are great. I've used these with an Audio-gd nfb.11, FIIO E9 and the builtin sound of my Asus motherboard. The sound on the NFB.11 is much better. With the other sources the sound can distort when driving heavy bass, but the NFB.11 can push the heavier sound at high volumes without distorting the and HD6XXs happily reproduce a great experience on the NFB.11.