Most importantly, I think the headphone sound is a big step backwards from the Duet 1. I had only praise for that marvelous original unit as a headphone amplifier. Now I feel like an imbecile for selling it before I'd tested out the Duet 2. The new unit sounds cold and analytical, lacking any sweetness and sounds... well, digital. After a full day (and evening) of use, I've yet to hear one recording that I've enjoyed via the Duet 2.
Does it need "breaking in"? That would be a blessing, but I don't think that will overcome this unenjoyable, sterile sound. To be fair, I have only listened through headphones thus far, and not through my Focal monitors. Headphones used include Sennheiser 600, Shure 840, some Beyer and Sony monitors.
This unit seems like an exercise in turning listening back to charmless early digital sterility.
I bought this from Sweetwater. I can't think much beyond returning it, but I've no idea what I'd go for instead. This is quite disastrous, actually.
Of course, if there is any improvement with more hours use, or if my ears adapt to the new characteristics, I'll report back, but I'm pessimistic.
PS: Is the USB connection to the Duet 2 really meant to be so tight? And the plastic top is horrible like the black shiny plastic on cheap printers and TV, where the reflections are wavy and appearance is grubby after any handling. A simple wipe scratches. This will soon look like junk unless it's never touched.