(1) Determination of crossover point
The crossover point is the dividing point between the high-pass, band-pass and low-pass filters of the crossover. It is usually expressed in units of Hz. The crossover frequency should be specific according to the frequency characteristics and power distribution of the speaker unit or speaker Make sure that when the speaker is shipped from the factory, the manufacturer will calibrate the working frequency band and frequency division reference frequency of each speaker unit. Generally speaking, the frequency division point should be determined according to the manufacturer's requirements.
However, sound engineers often encounter such problems in use. Because of the loss of the manual, it is impossible to know the crossover point parameters of a certain speaker. This requires adjusting the crossover point according to the evaluation results of human ear listening. When adjusting the crossover point, you should carefully listen to the connection of the sound of each speaker unit, and adjust to the state where the crossover frequency band is not blank.
The crossover point of the full-range ultra-low subwoofer is generally adjusted to 100Hz. If the crossover point is too high, the sound will be distorted. Everyone may wish to do an experiment, mention the crossover point to 500Hz, the bass sound will definitely have a sense of jitter, this is the cutting distortion.
(2) Sub-band gain
Due to the sensitivity of the speakers and the power ratio of the power amplifier, the sound of each frequency band will definitely be strong and the sound of a certain frequency band will be weak. In this case, the sub-band gain of the frequency divider needs to be adjusted.
In most cases, the sound of too strong frequency band should be attenuated to avoid burning the power amplifier or speaker unit of this frequency band due to the excessive signal after boosting. You will find that many manufacturers design the cross-band gain of the crossover to only attenuate and not improve (such as the DOD crossover), that is, when the maximum position is mentioned, it is 0dB (no increase or attenuation), and the attenuation is minimal The position is negative infinity, which is to avoid equipment damage due to signal boost.
(3) Other adjustments
There are many other function keys on the crossover. The function of these function keys is often not valued by people. In fact, adjusting them to the correct state will definitely further improve the sound effect.
(A) LF DELAY (bass delay) high and low bass separate speakers.
In the high-bass separate speakers, because the high-bass speaker units are installed on the front plane of the speaker. The treble is generally a horn, and the pronunciation point is rear; the bass is a cone-shaped cone speaker, the pronunciation point is front, and when the speaker sends out the sound, the situation that the bass first reaches the listener and the treble first reaches the listener. If the bass comes first, because of the predominant effect of human ear listening, people will feel the problem of bass advance, dullness or insufficient sound clarity; if the bass is properly delayed, this problem can be solved.
(B) MOno BASS (Mono Bass)
Is it better to choose the mono mode for the bass or the stereo mode? In my opinion, as long as conditions permit, the bass should be made as stereo as possible, for three reasons:
One is that the music bass is not mono but stereo, so in order to reproduce a true stereo bass, the stereo bass system should be used to play;
The second is the past view that the bass has no directivity, but modern speakers can already have a certain directivity, so of course the difference in their spatial location will be noticed by people;
Thirdly, according to the theory of physiological acoustics, there is a sense of localization of bass. Bass positioning mainly depends on the phase difference (time difference) of the left and right ears, so stereo bass and mono bass must feel different for listeners.
(C) POLARITY (polarity or phase) key
Almost all crossovers have this type of button, but the letters are marked with Inv, out Phase and so on. This button is used to adjust the phase of the output signal. When the speaker has reversed phase, you should press this key.
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