4-BAND SPEAKER FILTER Russian patent published in 2022 - IPC H04R3/12 

FIELD: radio engineering.

SUBSTANCE: invention relates to radio engineering. The 4-band speaker filter contains a low-pass LC filter, a low-mid-pass LC filter, a mid-pass filter, and a high-pass LC filter, the outputs of which are designed to connect dynamic heads. The first input of the filter is connected to the first terminal of the first capacitor and the first terminal of the first inductor. The second input is connected to the second terminal of the second capacitor, the second terminal of the second inductor and the second terminal of the third inductor. The first output of the second inductance coil is connected to the second output of the low frequency range dynamic head, the first output of the fourth capacitor is connected to the second output of the midrange dynamic head, the first output of the third capacitor is connected to the second output of the high frequency range dynamic head, the first output of which is connected to the second output of the fifth capacitor, and the latter is connected by its first terminal to the second terminal of the first capacitor and the first terminal of the midrange dynamic head. The first, second, and third inductors have the same inductance, the first, second, and fourth capacitors have the same capacitance, and the third capacitor has the same capacitance as the fifth capacitor.

EFFECT: increasing the linearity of the phase-frequency characteristic of the filter while maintaining the uniformity of its amplitude-frequency characteristic.

1 cl, 1 dwg