Definition for Hi-Z

High impedance (Z stands for impedance). The input or output impedance is relatively high, although what is "relatively high" depends on the type of gear. High-impedance mic outputs range from 500-50,000 ohms, guitars pickups from 7,000 to 100,000 ohms (depending on frequency), and tube guitar amp inputs are typically 1,000,000 - 5,000,000 ohms.

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