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16Ω headphones 1W (1KHz, 1% THD)
300Ω headphones connected 200mW (1KHz, <0.03% THD)
Headphone Output Impedance
From 10Hz to 10kHz <0.3 Ohm
Could the amplifier with the mentioned spec handle HE4XX well?
Provided it can drive >200mA, yes, but that's hard to tell from the specs. If I had to hazard a guess though, I think you're good.