The use of the frequency divider: As described above, the frequency divider has two types: active frequency division and passive frequency division. The passive crossover is fixed inside the speaker and does not need to be adjusted by the sound engineer. The active crossover method has many problems such as the correct use of the electronic crossover, reasonable connection and adjustment, so this article only Several major issues that should be noted in the use of active crossovers are discussed.
1. Panel and function keys: The front panel of the electronic crossover is shown in Figure 1. The function of each function button, button and interface is described below.
(1) INPUTGAIN input gain. The input signal level is adjusted, usually placed at the rib B position.
(2) LF DELAY bass delay. O-2ms (maximum 60cm) delay for the bass.
(3) LF/HF GAIN Low frequency/high frequency gain. Adjust the level of the low frequency band and the high frequency band.
(4) MUTE mute. Block signals from a certain frequency band.
(5) x-0VER PREQ crossover frequency (divide point). When dividing by two, there is only one crossover point; when three is divided, there are two crossover points.
(6) RANGE frequency range - o The frequency range is selected between 90-900 Hz or 900 Hz - 9 kHz.
(7) MODE frequency division mode. Two-channel two-way or mono three-way selection.
(8) MONO BASS mono bass. In 2-channel stereo mode, you can select a mono bass output.
(9) CD EQ constant pointing horn equalization. In the case of using a constant pointing horn (patent of the US EV Corporation), the high frequency band characteristics can be made better.
(10) LIMITER limit button. Output signal gain limit adjustment, used to limit excessive signal and protect the amplifier speaker.
(11) THRESHOLD threshold selection button. Choose a limit threshold range with -6dB and +18dBu options.
The back panel of the electronic crossover is generally based on various interfaces, as shown in Figure 2. The functions of each interface and function keys are described below.
(12) FUSE insurance and power outlets.
(13) SERIAL NUMBER product line number.
(14) HIGH/MID/LOW OUTPUT High frequency/intermediate frequency/low frequency output interface. When the two-channel two-way output is output, the high frequency and low frequency are output according to the frequency band above the interface: When the mono three-way is used, the high frequency, intermediate frequency and low frequency are output according to the frequency band below the interface.
(15) POLARITY polarity (phase) button. Use this button to make an inverting adjustment.
(16) INPUT signal input interface. The full-range signal is input from this interface, and the signal is input from the left channel when the mono three-way mode is used.
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