The sensitivity of the headphones F.A.Q.
is determined by the amplitude-frequency response curve F.A.Q.
with the specified sound pressure dB SPL of 1 VRMS
. For 0 dB, 20 μPa is assumed.
By the sensitivity of the headphones, you can predict the volume level developed by the headphones at any chosen frequency with the known supply voltage to the headphones from the amplifier. Three-wave smoothing F.A.Q.
is used to eliminate the interference of waves due to the use of a "point" microphone.
The frequency response in RAA is obtained through the reproduction and analysis of a special noise signal with the subsequent generation of an impulse response. The frequency response plot is constructed from the spectrum of the impulse response.
During the measurements, a special amplifier was used with zero total output impedance over the entire frequency range, which required no compensation for the amplitude response F.A.Q.
. The microphone is calibrated to 45 kHz F.A.Q.
with an appropriate frequency response correction.
The difference in amplitudes of 6 dB is equivalent to a twofold ratio of signal levels.
Original text in Russian report. You can help with translation via the forum or feedback.