Fuses that matter.

FWIW, during my recent listening experiment, I A/B'd fuse direction in the amp (Pass XA30.5). I must have switched fuse direction 15 or 20 times.

I SOMETIMES thought I MIGHT have heard a difference, but it was well within the category of -yourmindisplayingtricksonyou-. I'm not saying that fuse direction can't have audible effects. I'm just saying that, for me, it did not. That could be because...

1. My ears aren't good enough.
2. My system isn't good enough.
3. My amp is not sensitive to fuse direction.
4. Nothing is sensitive to fuse direction.

About which is true, I don't really have an opinion.

Bryon

"A good design will minimize or eliminate sensitivity to those differences, within the range over which they can be expected to occur"

Exactly. I'm surprised that people can hear difference in DACs and preamps - electronics that has regulated power supplies and draws low and pretty much constant current.

One possibility why differences in fuse direction might be difficult to detect is that the speakers and/or other components that have fuses must be addressed as well. For example, if a given system has eight fuses and only two fuses are replaced with aftermarket fuses, there is a 50% probability that half the remaining fuses are not in the correct direction. So, one might reasonably conclude, assuming that fuse directionality is real, that distortion and noise produced by the remaining unchanged fuses are masking the positive effects of the two new fuses. There is also the real possibility that other undetected problems in the system are (also) masking the effects of the new fuses.

For those who likes to travel I offer to try out testing on the different pole. It's all reverse there. Make it directional LOL!

Marakanetz, don't forget that for Russian Orthodox fuse should always point to the east while for Muslims direction of Mecca is pretty much mandatory.