Sony XA5400ES fuse directionality...

It looks like the fuse in on an AC line which means no matter how you install it it will be in the right direction 50% of the time.

There are two fuses in the unit, and I was hoping to find someone who was familiar with it before I had to test the directionality by ear, which I have done before with my amp and it's single fuse. It seems to take a about 100 hours for the fuse to "break in". The latest Hi-Fi Tuning fuses DO make a sonic improvement to my ears, and I feel they are worth the $50 price tag. I know that there are some doubters out there when it comes to fuses, AC cables, speaker wires etc... but I am not one of them. They certainly won't make you think a drastic improvment has just occured by upgrading to one, but these little 5% improvements all add up and contribute to the overall sonic "picture".

They can make a difference around 4k hz. Some people like that.

They make no difference. Try to return them if you can.

I appreciate the input guys. I did hear an improvement in clarity and improved background details with the one I put in my amp. It was a bit bright at first, but smoothed out after a couple of weeks. I also tried the new Nano Liquid fuse, and it really rolled the highs off substantially. The dealer said the Liquid fuses have "smoother, analog sound", but to my ears it sounded like everything above 10khz was rolled off. I sent that one back right away for a refund!