Audiophilepure

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“I found no issues without having a gain switch on the ONE. The range of the volume control was very wide, so the ONE worked fine with both my Shure SE-425 IEMs and my Sennheiser HD-600s (I didn’t listen much with the 600s, but I wanted to be sure the ONE would drive them successfully). Battery life was very good. I did all my testing on a single set of batteries. While a rechargeable battery like all the other amps in this roundup is nice, good old-fashioned AAs have their advantages. If they’re flat, all you need to do is put in a new set. If one of the other amps is flat, you have no choice but to recharge, which isn’t much of an option if the plane is boarding right now”