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== Line Level ==The line level jacks on consumer electronics are typically unbalanced accepting a [[TRS Phono Plug]]. Unlike the weak signal from a microphone, a line level signal is at the highest signal level before final amplification and output to speakers. Consumer line level is rated around -10dBV while there is a different level for professional studio equipment. The most common nominal level for professional equipment is +4 dBu. A line level describes a line's nominal signal level as a ratio, expressed in decibels, against a standard reference voltage. You never want to send a line level signal to the microphone input of an audio device. == Microphone Level ==After the microphone level input goes into an audio device it goes through a preamplifier to boost the signal up to line level. Instrument level input is also very weak, however, may have more variance than that from a microphone. Both will be increased by a preamp prior to mixing or further amplification.When a microphone picks up an acoustic sound wave, it generates a very small voltage waveform which is measured in microvolts.