Conversion: Voltage V to dB dBu dBV and dBm Google Pagerank
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-10 dbV +4dBu + 6dBu 0 dBm milliwatt milliwatts watt Sengpiel Berlin sengpielaudio
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• Conversion: voltage V → dB, dBu, dBV, and dBm •

Usually we measure AC voltage V as voltsRMS.
Voltage V:  volts  
   
  
   
Voltage level L:  
  dBu reference: 0.775 V
  dBV reference: 1 V
  dBm > > >   ref. 1 mW at ohms

The index at 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 means 1 milliwatt as reference value for 0 dB.

If the reverse conversion is needed, go to: Conversion: dBu to volts, dBV to volts

What is dBu? A logarithmic voltage ratio with a reference voltage of 0.7746 volt ≡ 0 dBu.
What is dBV? A logarithmic voltage ratio with a reference voltage of 1.0000 volt ≡ 0 dBV.
What is dBm? A logarithmic ratio with a reference power of 1 milliwatt ≡ 0 dBm.

The home recording level of -10 dBV means 0.3162 volts, that is -7.78 dBu .

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