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I was thinking of picking these up but noticed they have 300ohm impedance. I don't think they'd be powered well enough from my new MacBook air's ports. I do have a USB dac that I sometimes use, but not sure if utilizing the USB C port vs the headphone port provides the headphones with more power or not. Anyone have any insight? I do not want to buy a separate amp since I'm almost never at a desk when I am on my laptop. Otherwise, I'll just go for a pair of hifiman 4xx.
For HD 6XX, you need an amp that provides atleast 1V for reproducing the entire dynamic range of modern music. Iphones, LG V20/30 and some Samsung Galaxy phones can output 1V which is sufficient. There are many USB DACs that can also provide such high voltage.