JaegerDYes, and at least with Sundara headphones there was clipping at higher volumes until I switched to balanced (using the 789). Very annoying. And bass and instrument differentiation improved too. So I wouldn't get this amp unless I were using a very easy to power headphone.
hddugganLiterally not the same single-ended performance as the 789.
That said, outside of a pre-amp switch, this isn't as powerful as a Schiit Magni Heresy, which is between $50-$100 cheaper.
postwarscarsSE output is lower than the Heresy, but it has more gain stages, better measurements, and front toggles for power & pre amp. SE output in both is higher than the Magnius, which is Schiit's competition in this price range.
Subjectively, I think the pot on this is significantly better than the one on the Magni 3 (base), which is likely to be similar to the Heresy or 3+. Schiit makes solid products, but they are known for scratchy pots and occasional channel imbalance in the low end, perhaps due to having such high gain and power in budget devices.
Tombot3000Well, the Magnius has a tacked on SE output, because it's meant to be a balanced amp primarily.
I'm sure the pot on this is better. It's also $50-$100 more expensive. The 3+ and Heresy do have a less-than-amazing pot. As for the performance, I can't tell a difference between the Atom, Heresy or 789, and I doubt the One would change that, so it comes down to features in my opinion. If I was in the market I just don't know if I'd spend $150-$200 on this, personally.
postwarscarsSure, but balanced isn't purely beneficial - the sound difference is minimal if perceptible at all, the extra power is only useful if you have headphones so hungry that none of these SE amps should be on your list anyway, and third party cables are significantly more expensive.
If you're looking for medium-power, SE capable amps, the ONE has 2nd most power, 2nd best pot (IMO, this is subjective), tied-ish for best measurements, medium size, pre-amp out, and front switches working in its favor of the main ones in question. It's also regularly $150 instead of $200, which is a nice price point.
I wouldn't recommend any of the amps in question as a universal choice, but they each make an argument for themselves depending on what features you value and how important price is.
Tombot3000Balanced is beneficial in that it rejects noise and has more power, but there's no sound quality difference if the engineering is proper. The cables aren't that much more expensive, really, and extra power is almost always useful (within reason).
Anyway, I'm not saying the One is bad, it just wouldn't be my first choice at $200 (especially if the 789 hits $250). But I think it's because I can do without convenience features, personally. Not everyone shares my tastes, which is totally fine.