I am using a Hifi Tuning Supreme fuse to good effect. I haven't tried anything else to compare but it was a definite step up from what the unit came with.
In my system, I found the Octave very responsive to all the power cords I tried, including Mac HC, Electraglide SOTU, Synergistic T2, Triode Wire 10+ and a homebrew all silver pc. All give a different flavor to the sound and are a worthwhile investment. My preference were either the SOTU or T2. I have not bothered with the BNC mod but some type of footer under the unit seems beneficial. My Octave rest on a granite slab sitting on BDR cones.
In my system, I found the Octave very responsive to all the power cords I tried, including Mac HC, Electraglide SOTU, Synergistic T2, Triode Wire 10+ and a homebrew all silver pc. All give a different flavor to the sound and are a worthwhile investment. My preference were either the SOTU or T2. I have not bothered with the BNC mod but some type of footer under the unit seems beneficial. My Octave rest on a granite slab sitting on BDR cones.