I used the MCRU linear power supply with the QuteHD and heard a significant improvement. What I liked most was that it gave the dac more weight to the sound and filled it out so that it was able to convey a more realistic sense of the instruments being played in your livingroom. Previous to the MCRU, I thought it sounded a tad lean. The MCRU is a two box unit hand crafted in the UK for $340 shipped. I haven't heard the King Rex or CI, so can't comment on those. My guess is that the you will also hear a dramatic improvement with any of these 3.
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