Lak,
I haven't tried the HF power cable on my phono-pre or the amps but I have done these type of comparisons with other power cords. The biggest improvement came at the phono-pre and the DAC. The DAC and phono-pre are more sensitive to noise because the audio signal is relatively low in these devices so if you can lower the noise going into them, the signal-to-noise ratio improves. Anyway, I think this would also be true for the HF power cable.
John
I haven't tried the HF power cable on my phono-pre or the amps but I have done these type of comparisons with other power cords. The biggest improvement came at the phono-pre and the DAC. The DAC and phono-pre are more sensitive to noise because the audio signal is relatively low in these devices so if you can lower the noise going into them, the signal-to-noise ratio improves. Anyway, I think this would also be true for the HF power cable.
John