Thanks for your input. I have a 5V 2A wall charger permanently connected to the Mojo and get no noise. (You may have gotten one of the unlucky noisier units. But you should charge it to full while it's off, then trickle-charge it during playback, which could solve the noise issue.) I'm also using TOSLINK, which electrically isolates the DAC. (Some say it sounds better than USB.) And I'm using it as a DAC + digital preamp for active speakers. (I'll have a passive floorstanding speaker system next week.) I used to own an HD 800. The differences between the Mojo and solid state DAC/amps that cost thousands were minimal for me with that headphone. It's easier for me to assess DAC differences with speakers. I'm really curious about the Yggdrasil, so I dunno if I'll try the in-between multibit DACs. It's interesting how many conflicting opinions there are on Schiit vs Chord. For the record, they all (or rather, the Modi Multibit, Mojo, and 2Qute in my case) sound fantastic with my speakers, with each having a different presentation that enhances the core signature of the speakers in assorted ways. The 2Qute sounds considerably more realistic than the Mojo (especially in terms of resolution and dynamics), but costs a lot more, which is the main reason I parted with it. If I could only make one complaint about the Mojo, it would be that it's a little too smooth. (The opposite of crunchy in my experience.) I'm on the lookout for a more aggressive-sounding DAC that isn't particularly expensive. (Won't get back into higher-end DACs until a little later.) The Modi Multibit is the closest I've gotten to that, but it comes off as crude to me, and it also has qualities that I'd describe as tubey and emotional. (Which is nice, but not exactly what I'm looking for.) Perhaps I won't be able to find a DAC under $500 that has the aggressive, yet refined type of sound the 2Qute has.