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Crack is really designed for headphones with an impedance of at least 120 ohms and it's most optimal with headphones over 200 ohms. That's why we have that extensive list of headphones that are an optimal match. I'm not saying that it won't play music with other headphones, just that we want to be sure that everyone understands that it is optimized for high impedance cans. The high impedance Sennheisers and Beyer Dynamics are a sure thing. HE500s are really nice! They are 38 ohms I believe, and we have a couple of other amps that would be optimal for them.