This is not a headphone amp, it is a DAC, but if you, against my recommendations, choose to plug your high-end phones directly into it you may realize that it is indeed not an amp but a DAC -- an excellent DAC that I become to love.
I seriously needed to downsize to have something more portable which I may set up at hotels on my trips between Europa and Asia. Wow, Tone board 2 Pro is an excellent DAC and, to me, it wasn't difficult at all to learn how to operate. Both power and audio go through a single USB C cable from Raspberry PI USB 3, which reduces adapters, bricks, and cables -- good for me on the go. The annoyance is that the blue light, which indicates MQA Studio, disappears after a while. Tone board 2 Pro integrates well with Volumio3 with no additional drivers. The amp is Zen Can Signature V2 HFM.
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I tried ifi xDSD Gryphon, but I did not like its amp performance and the price-performance is terrible. Along with xDSD, Gryphon I tested the ifi iDSD micro signature. It sounds lovely but has no MQA decoder. While comunting I am going to use Ifi Go Blu thou, which replaces BTR5 and E1DA 9038S G3.
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