I only tried the default mode (pll on and off) and i alway upsampled 44/16 to 48/24. Sounds clean and natural. You get the dynamics of OS and still get the smoothness. I use a balanced isolation transfo, which i believe is helping. I have not played with power cords, which i will do eventually to make the sound crisper. I only use very smooth power cords right now for the whole system. Not sure the Power Plant Premier is equivalent. The ac regeneration is probably specifically tuned for each specific gear in the he series. The r2r 7 certainly exceeded my expections by a big margin. I feel like i own a 10k dac.