Active low frequency distortion correction circuit

The active low-frequency distortion correction circuit is an accessory of the German CAN fflN bookshelf box FONUMSC-3. Due to the use of
active low-frequency distortion correction technology (sc technology), the low-frequency response of this two-way inverted bookshelf box with an 8-inch mid-bass unit and a volume of only 22 liters
is expanded to 22№. This circuit is connected before the power amplifier.
    Figure 9-70 is a channel of the active low-frequency distortion correction circuit. Figure 9-71 shows its amplitude-frequency and phase-frequency characteristics.
    As can be seen from the figure, this is a high-Q high-pass filter characteristic with a passband gain of 1, a
resonance peak of 14.4dB at 35.8°C, and an attenuation slope of approximately 30dB per octave. The
    inverted speaker can be equivalent to a high-pass filter, with an attenuation slope of up to 24 per octave. As long as the compensation
circuit has an appropriate Q value and the resonant frequency is appropriately designed, the low frequency of the speaker can be well compensated. response, making the synthesized
sound pressure frequency response curve smoothly extend to ultra-low levels. This is the essence of SC technology. SC technology performs low-frequency compensation on
inverted speakers with large attenuation slopes, so that the entire speaker system forms an 8th-order high-pass system.