Not uncommon, M51's, Vegas, Dspeakers all come and go in waves at times. Owning a DS, I will say that it demands a lot from the owner to get the full potential out of it, patience is a virtue.
I sold mine to go to a more expensive DAC. I submit the DSD is great and you need to spend a lot more money to improve what it does. New they are a good deal, but at the current used priced they are an outstanding deal.
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