Fuses that matter.

Mapman, not all circuit designers, even good ones, are aware that direction matters. E.g. caps, I would say most tube amp manufacturers do not place the metal film coupling caps correctly and a lot of cap brands do not mark where the outer oil is (that should be connected to the path closer to the electric ground) to have a better sonic quality. Similar to the fuse direction, when deployed correctly, the sound offer more clarity.

Often those with an investigative mind and/or have system and ears or setups like great headphones can discern the difference and in the very small niche of audio gear, it is not the first time that DIY and audio enthusiasts discovered what designers and manufacturers did not know.

The molecular structure of all metals is crystalline. The grain boundaries of the crystals, and oxides between, can act as mini diodes. That's why oxygen-free(7N) and Ohno Constant Crystal wire is so popular, in higher-end cabling. When drawn into wire; the crystals form themselves into a consistent chevron pattern(ie: <<<<<<<). That wire can be found directional when passing electricity, should not be a surprise(even in a fuse).

Jazz,

I have no doubt anything different can make a difference. Caps, wires, fuses, not exactly apples/apples. The question is always how much, how significant, how much it matters, etc. Lots of things add up to a good design and good performance. Its not rocket science but no doubt some do things right and some not so much. I try to stick with vendors and products that have been around awhile and have a reputaiton for doing things right. Not to say there is no room for further tweaking, but you have to prioritize somehow. Most do not have infinite time available to much around with every minute aspect of everything.

TO each there own. It's all understood well enough to deliver SOTA results I think. ITs not rocket science. WHatever floats ones boat is always fine with me, even if I do not agree.

A bit more insight, regarding metallic molecular structure, available here: (http://www.chemguide.co.uk/atoms/structures/metals.html)

There is a difference between theoretic models, even if 100% precise, and mattering.

Just saying...