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Interconnects, speaker wire, power cords. Ask the Cable Guys.

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RE: MAny power supplies for audio use various multi pin connections

Posted by Jonesy on March 24, 2017 at 17:29:24:
Read part way down in the Wikipedia link.

Maybe a good analogy is to picture 3 AC currents out of phase so there is never an "off" cycle, or interruption in flow. This is quite advantageous when you are working in AC for small voltages used in audio and broadcasting equipment. And for large industrial equipment, like motors and such. Hope that helps!

Cheers!

Jonesy