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- Sep 21, 2018
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https://www.amazon.com/FiiO-Headphone-Amplifier-Computer-Balanced/dp/B07KR3RF4H
Well the Fiio K3 was released and seems to fit your bills perfectly (USB powered, big knob, digital volume control, lots of output and even 2.5mm balanced for extra voltage). The only gripe I might have with it is that USB powered means not much power, and for 500$ there's are many other better options if you don't mind the battery.
But I see you have the ifi already, though it's measurement aren't the greatest I don't think it's noticable if your workspace is noisy.
That unit looks interesting, though I'm annoyed by this trend of needing to use balanced cables to get decent output power. I don't want to have to re-cable all of my headphones.