Determining current flow to install "audiophile" fuses.

" You cannot extrapolate or generalize your negative results to make some grand statement such as, "I tried the fuse and didn’t hear anything, therefore it doesn’t work." "

Well I did try reversing directions and heard nothing so yes I can.

Don’t be scared......

You've done nothing but run your mouth.

Phew, what a discourse...
I have to say I am on the side of Oregonpapa, I have no electrical engineering experience either, but I have to say switching to the Hifi Tuning fuses made a difference to the sound my stereo produce. I only bought the fuses on the recommendation from SMc, and because the model was being discontinued and was on sale.
Would I have bought an $80-100 dollar fuse? No Way!
Since there are many variables that could have affected the sound (even the contacts of the fuse), I can't say for sure if it did something on its' own.
But, for my old ears, it did change something, mostly for the better.
As for reversing fuses, I would like to do this, but am now working more than playing, so it has to wait. Also, I don't think I can make a scientific/unbiased report when I have to power down the amp, replace the fuse and restart everything-every little change adds another unknown to the equation. 

I’m going to develop and market an audiophile grade bi-directional fuse and nip this thing in the bud. With this product, IT WON’T MATTER AND THERE WILL BE NO UNCERTAINTY! :-)

I’m going to develop and market an audiophile grade bi-directional fuse and nip this thing in the bud. With this product, IT WON’T MATTER AND THERE WILL BE NO UNCERTAINTY! :-)

We've already got one!

27 years ago we recognized that fuses can affect the way our equipment sounds. At the time, there were no boutique fuses, but we sorted out a fuse that in fact did sound better, and designed the sheet metal for our MA-2 to accommodate it. We still use this fuse today; interestingly enough it sounds better than the boutiques we've tried and it does not cost as much, although its not a cheap fuse by any means. However it must be built pretty well as reversing it in the holder has no audible effect whatsoever.

27 years- does that make us one of the first manufacturers to recognize this phenom? I think it does.

FWIW the stock slo blo fuse that came in my ARC sp16 appears to have been well thought out to start as well. It is quite substantial and unique in its build compared to most common slo blow fuses I have seen over the years.

How much a "good sounding" fuse need to cost is a whole other can of worms. Slo blo or otherwise.  It can cost as much as someone is willing to pay based on it "sounding better"  even if for totally unknown reasons.  

So its not a given that all high end vendors just shove any old fuse in there to start with. Good vendors tend to think everything over pretty carefully.

Another reason to not generalize and say fuse X always sounds better. What one starts with is certainly a factor as always. No mysteries there. A change in one case is not the same as in others.

Also interestingly the fuse is not symmetrical in its build which is obvious to the naked eye (unlike crystal patterns of metal) and reversing that does nothing as well.