• The table shows the voltage equivlent to a given level in dBu from +40 dBu to -40 dBu
  
• dBu is a logrithmic voltage notation relative to 0.7746 Volts but not related to any impedance.
  
• dBm (the traditional unit 50 years ago) is relative to 1 mW into 600 ohms and is numerically equal to dBu.
  
• dBV (rarely used) is relative to 1.0 Volts and like dBu, is not related to any impedance.
  
• Comments and questions to support@sowter.co.uk

• To convert max level at 50 Hz to 20 Hz subtract 7.96 dB
  
• To convert an rms voltage to a peak voltage multiply by 1.414
  
• To convert an rms voltage to a p-p voltage multiply by 2.828
• To convert a dB value to a ratio in Excel: Ratio =POWER(10,dB/20)
• To convert a ratio to a dB value in Excel: dB =20*LOG(ratio)