Several different types of devices are used to boost microphone levels to line–level signals. Microphone level is usually specified between -60 and -40 dBu. (dBu and dBV are decibel measurements relative to voltage.) Of the four main types of audio signals, mic level is the weakest and requires a pre-amplifier to bring it up to line level. This voltage varies in response to changes in sound level and distance.
What is mic level?Ī mic-level or microphone-level signal describes the voltage generated by a microphone when it picks up sound, typically just a few thousandths of a volt. (We’ll get to instrument- and speaker-level signals in a minute.) The voltage of each signal type varies significantly, however, making it important to know how they differ. Wired and wireless microphones are typically connected to mic-level inputs, whereas most other audio devices use line level. Simply stated, these both refer to the voltage level of an audio signal. We’re often asked to explain the difference. Are you confused by line level versus mic level? Well, you’re not alone.
