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There are some "audiophile fuses" in the market, and the manufacturers claim that they are directional.

Here are some examples:

Here is a quote from a fuse review (yep...):

  • "After a few hours I received a reply from Mr. Stein with a question that turned the dance around. He asked if I installed each fuse using the directional arrow shown on the fuse logo. He informed me these fuses are directional and must be installed in that manner to work correctly." A fuse review at the Stereo Times

Now, my question is how can AC fuses be directional, given the nature of AC?

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  • \$\begingroup\$ Some devices (very few) are directional when it comes to audio. Fuses are not one of them. \$\endgroup\$ – Ignacio Vazquez-Abrams Nov 7 '15 at 19:11
  • \$\begingroup\$ They have to be aligned magnetically with the earth and switched into reverse on a leap year too. \$\endgroup\$ – Andy aka Nov 7 '15 at 20:57
  • \$\begingroup\$ They aren't directional and won't improve signal performance. \$\endgroup\$ – jippie Nov 8 '15 at 7:44
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There is much snake-oil around audio equipment. I am consistently amazed at how many new ways can be found to part the gullible from their money. Directional fuses is a new one on me! I so wish I had the imagination and lack of morals to allow me to make money like this.

There is one way you can actually make fuses directional, and that's put a different size of connector on each end. You can also print an arrow on them, put a note in the datasheet, and charge 100x more than for the old bi-directional ones.

The fuse comprises 20mm of the 200km path from generator to amplifier. Mains carries RF interference on it, with added 1500v spikes. It's worth adding an RF filter, it's worth some TVS over-voltage protection diodes. Is it worth silver plating 0.00001% of the generator to amplifier circuit? I think not. I notice one of the fuse reviewers removed the fixed cord and replaced it with an IEC socket. Do you know what the contact material is on those?

A friend once asked me if there would be any audible difference between wiring speakers with 160 strand oxygen-free linear crystal copper speaker wire, or 4mm2 twin'n'earth. I said yes. If you use the twin'n'earth, you will have much more money left over to buy music.

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