The difference between passive electronic frequency divider and active electronic frequency divider

The electronic frequency divider is divided into passive type and active type according to whether the amplifier is used or not. Among them, the passive type is composed of resistance-capacitance parts, its structure is simple and there is no additional distortion, and it is the leader in audio electronic crossover from the comprehensive index.

Introduction to Passive Crossover

Passive frequency divider is divided into several kinds according to order-order, second order, third order, fourth order, etc.

The higher the order, the higher the frequency division slope and the cleaner the frequency division. However, the higher the order, the greater the phase distortion, and it is easy to make people feel "weird" in the sound. Design the frequency divider, if the unit characteristics are better, try to use a low-order frequency divider.

Commonly used in professional sound reinforcement products are second-order or third-order crossovers.

According to the unit configuration of the speaker, passive crossovers are generally divided into two frequency divisions and three frequency divisions.

First-order two divider

Calculation of capacitance and inductance capacitance C=1000000 (2T *f*Z) unit: microfarad (μ F)

Inductance L= (Z*1000) /(2Ï€ *f) Unit: millennium (mH)

Where f is the frequency value of the frequency division, the unit impedance value, and π is the value of the pi rate of 3.14.

For example, the unit impedance is 80, the frequency division frequency is 2000 Hz, and the capacitance of the frequency division capacitor is calculated:

C=1000000/ (2*3. 14*2000*8)

=10μ F

Inductance calculation

L= (8*1000) / (2*3. 14*2000)

=0.64mH

The difference between passive electronic frequency divider and active electronic frequency divider

First-order frequency division capacitor inductance

The difference between passive electronic frequency divider and active electronic frequency divider

Second-order two divider

Calculation of capacitance and inductance

C=Q* 100000 (27*f*Z) L=Z* 1000/(2n*Q*f) Q value is selected between 0.5-1.0. Among them: ButterWorth Q=0.707

Bessel Q=0.6Linky-Raily Q=0.5

Using ButterWorth, the Q value is higher, which can reduce the capacity and inductance of capacitors and inductors, and reduce costs.

The difference between passive electronic frequency divider and active electronic frequency divider

Second-order frequency division capacitor inductance

The difference between passive electronic frequency divider and active electronic frequency divider

Active crossover related

The difference between passive electronic frequency divider and active electronic frequency divider

The difference between passive electronic frequency divider and active electronic frequency divider

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