Well it was a direct comparison to Ananda.Assuming you don't have an amp up to the job. The XS was said (somewhere in HF the past two weeks) to be 3-4 more db efficient than the HE-500. The HE-500 has long been blessed around here for needing 2 wpc @ 50 ohms to fully function. So are we talking 1.5 wpc? Also most SS amps put out more power at lower impedance, not less.
Given the impact made by the HE-6 11 years ago and the follow ons, the headphone amp market has radically changed wpc wise. There are Schiit amps for what $250-350 that have 4, 6, maybe 8 watts. Daps with similar stats. Used, kits....
It's a legit concern, but people should check carefully before they act given what they have/want/can afford.
Ananda being so efficient not needing an amp at all!
My Chord Mojo can drive it very well.
it can do 400mW at 32 ohm, so about maybe 700mW at 18
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