Zero phase is universally desirable but difficult to achieve. There are two versions of zero phase, known as American polarity and European polarity.

American polarity is described as: An increase in impedance yields positive amplitude normally displayed in blue. A decrease in impedance yields negative amplitude normally displayed in red.

American polarity is described as: An increase in impedance yields positive amplitude normally displayed in blue. A decrease in impedance yields negative amplitude normally diplayed in red.

European (or Australian) polarity is described as the reverse, namely: An increase in impedance yields negative amplitude normally displayed in red....

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