It's actually an integrated amplifier. Onkyo A5-VL. Not sure what the minimum recommended headphone impedance is (doesn't seem to be listed in the manual). It can drive 600ohm headphones though without a hitch. Just wasn't sure what would happen if you put a pair of low impedance headphones in an amp that had a higher minimum requirement than what the headphones are capable of. 25ohm for the D600 is pretty freakin low.
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