Currently the best solution is the Korg MR2000S ($1200 or so). It will record effortlessly and save the file as DSD2X. You definitely want to do this once at the highest resolution possible.
I used this at RMAF to showoff DSD2X through our Playback Designs 3 Series DAC. It was terrific.
I used this at RMAF to showoff DSD2X through our Playback Designs 3 Series DAC. It was terrific.