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Consumer rated line level is known as Hi-Z (high impedance) and, as stated above, operate at a -10 DBv level. There are also Hi-Z microphones available that use 1/4" plugs and operate at about -20DBv level. Some guitars and all electric keyboards are also Hi-Z.Professional devices typically use XLR and are considered balanced. These are Lo-Z and operate at +4 DBm level. There are Lo-Z microphones which will operate at approximately -50 DBm level.When a microphone picks up an acoustic sound wave, it generates a very small voltage waveform which is measured in microvolts. When a microphone picks up an acoustic sound wave, it generates a very small voltage waveform which is measured in microvolts. The line level signal needs to be reduced and impedance matched to send it to the microphone input of such a device. This will come with a cost. There will be a reduction in quality and impedance matching may be tricky. (Hi-Z, Z = impedance) The line level signal needs to be reduced and impedance matched to send it to the microphone input of such a device. This will come with a cost. There will be a reduction in quality and impedance matching may be tricky.