Signal Type Level (approx) In dBu In dBV Voltage (RMS) Description
Mic Level Very low –60 dBu to –62 dBV between 1 and 10 mV Raw mic output; needs a preamp
Instrument Level Low-mid –20 dBu to –22 dBV around 100 mV Electric guitar/bass, unbuffered
Consumer Line Level Standard –10 dBV to –7.8 dBu
around 316 mV Home stereo, computers, etc.
Pro Line Level Hot +4 dBu to 1.78 dBV
around 1.23 V Mixers, studio gear, PA systems
Headphone Level Variable
0 to +10 dBu
–2 to +8 dBV
0.7 to 2.0 V High enough to drive speakers or ears