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is it ok for Hifiman HE-400 cans ?? i mean, what do you think about drive orthos with IconHDP ?
Wouldn't recommend it. Volume pot already goes up to about 40% on a Grado, so it wouldn't have the power to effectively amp orthos.
@manzana: yes, it's functions perfectly well with ortho's. Drives my Mad Dog's, HE-4, HE-500, and HE-5LE with ample headroom.
You must have had a bad unit. I ran PS 500's as loud as I could possibly stand at about the 1 o'clock position. I don't care what Nuforce said, that was not normal for this DAC/Amp. As you can see from the above comments, Night Crawler more than sufficiently ran orthos with the HDP