Sony XA5400ES fuse directionality...

Sorry to have opened up such a can of worms here... I was hoping not to ruffle the feathers of the "non-fuse believers". Yes, standard fuses are non-directional obviously, but the Hi-Fi Tuning fuses are suppose to be installed in the direction the arrow indicates toward ground. We are not crazy, we are audiophiles that can actually hear slight changes, both bad and good. If I can clearly hear differences between brass and copper binding posts, wire terminations, AC outlets, AC cords and interconnects, it would make sense that I could hear the difference in a half-inch long fuse that is made from silver and ceramic instead of glass and various less conductive metals. When you think about it, the fuse is your "weakest link" between the incoming AC and your power supply. It is not too far fetched for audiophiles to think this way. If your system is very resolving and your ears are not too far gone that is....

Such claims SHOULD be testable.

That's what your ears are for. I did also test the Hi-Fi tuning fuses with a resistance meter just for kicks, compared to the stock fuses, and yes, they did consistently show less resistance on the meter.

You were able to consistently measure such low resistance? What kind of meter are you using?

This is how littlefuse approaches fuse resistivity:
http://www.littelfuse.com/data/en/Technical_Articles/TB98-004.pdf

Here is the data for a 2ag, 5 amp fuse, which should be in the 'normal' range for power supplies of larger amps.
NOTE: resistance, measured cold, is <.02 ohms.

http://www.littelfuse.com/products/Fuses/2AG+(5x15mm)/208/0208005..html

Now, I have a cheap-o meter which is of low resolution. I'd like the bench meter I had at work years ago which had 8 or 9 digits of resolution.