Types of Audio Signal Levels

Keep in mind these are all electrical signals.

Microphone level (The output level of a microphone is relatively weak and needs to be boosted up to Line level using a microphone preamplifier)

Line level (The standard level at which audio signals travel through gear, mixers, etc. and the level at which recordings are made)

Instrument level (The level coming directly out of an electric guitar, etc. which also needs a preamplifier)

Speaker level (The level needed to drive a speaker, which is MUCH stronger than line level)

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