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If the vertical axis is set to dB, the shift will still be given in dB The curve is shifted, and the amount of shifting in dB is given from the setting shown below.
If the vertical axis is set to Linear or Squared (energy), the setting will change as shown below
From above, we see that the curve can be multiplied with a factor and even subtracted by a value. Both multiplication and subtraction is used in the setup for measuring loudspeaker impedance (it depends on how the circuit is connected).
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