Level in psycho acoustics as subjectivly perceived loudness (volume)

Infoclick 1 2 5 Equals 2/3

The vague human feeling of the double loudness (volume) is specified
with about 6 to 10 dB. This personal feeling is not an exactly measurable value.

Conversion Factor, Ratio, or Gain to a Level Value (Decibels dB)
Amplifier conversion – Convert decibels to voltage gain / loss
Calculator Voltage Gain – Voltage Loss and Power Gain – Power Loss

Conversion: Gain G, Voltage ratioAV, and Power ratioAP

Voltage gain in dB


Power gain in dB

Voltage ratio = amplification factor (voltage)
Power ratio = amplification factor (power)
V1 = Vin and V2 = Vout.
V2 > V1 or Vout > Vin means amplification. The dB value is positive. (+)
V2 < V1 or Vout < Vin means damping. The dB value is negative. (−)
V2/V1 or Vout/Vin means the ratio. The amplification or the damping in dB is:
L = 20 × log (voltage ratio V2 / V1) in dB. V1 = Vin is the reference.


The word 'power amplifier' is a misnomer - especially in audio engineering.
Voltage and current can be amplified. The strange term 'power amplifier' has
become understood to mean an amplifier that is intended to drive a load such
as a loudspeaker.
We call the product of current gain and voltage gain 'power amplification'.



Infoclick 1 2 5 Equals Kilograms

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Infoclick 1 2 5 Equals Ounces