The following slide show is the first finite element computer simulation ever done looking inside 3 different copper conductors geometries. You are looking at the current inside a cross section of 3 different wires at different frequencies. Before this we use to guess what the current looked inside a conductor and talk about skin effect but ignore the proximity effect because we could not model it. Read our white paper for more detail.

Why do Hollow Oval cables sound better?

As the frequency is raised to 4 kHz, non-uniform current distribution appears in the round conductor cable. This change alters the resistance and inductance properties of the cable, an unwanted effect.

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Why do Hollow Oval cables sound better?

The plots at 10 kHz show increased areas of reduced current density for both the rectangular and round geometries. The effect is much more pronounced for the round conductor, which leads to greater changes in its electrical parameters.

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With API’s Hollow Oval design, note the uniform current distribution, even at 20 kHz. This is why the electrical properties of the API cables don’t change, and why more of the music is delivered to your speakers and to your ears.