| Deutsche Version |
The index at decibel (dB) means u = unloaded, V = volt, and m = milliwatt. Some say: The "u" in dBu
implies also that the load impedance is unspecified, or unterminated and is likely to be high.
The index m at dB (decibel) means 1 milliwatt (power) as reference value for 0 dB.
If the reverse conversion dBm to volts is needed, go to the converter at the bottom.
What is dBu? A logarithmic voltage ratio with a reference voltage of V0= 0.7746 volt ≡ 0 dBu
What is dBV? A logarithmic voltage ratio with a reference voltage of V0 = 1.0000 volt ≡ 0 dBV
What is dBm? A logarithmic ratio with a reference power of P0 = 1.0000 milliwatt ≡ 0 dBm
The max. home recording level of −10 dBV means 0.3162 volts, that is −7.78 dBu
| Level | ![]() |
Voltage |
With the known impedance value you can convert voltage V to level dBm (power) and vice versa.
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