According to the place of use and the requirements for sound, the speaker horn should be selected in combination with the characteristics of the speaker. For example, for outdoor voice-based broadcasting, electric Speakers Horns can be used. If higher sound quality is required, electric speaker boxes or sound columns should be used: for indoor general broadcasting, small Horn Speakers made of a single electric paper cone speaker can be selected. : For listening to music or for high-quality PA loudspeaker amplification, a speaker box composed of high and woofer speakers should be used.
The following points should be noted when using the speakers:
(1) The power received by the speaker should not exceed its rated power, otherwise, the voice coil will be burned, or the voice coil will be scattered. The working voltage of electromagnetic and piezoelectric ceramic speakers should not exceed 30V.
(2) Note that the impedance of the speaker should be matched with the output line. For details, please refer to the section on amplifiers.
(3) To correctly select the model of the speaker. If it is used in the square, the tweeter should be used; if used indoors, the paper cone type speaker should be used, and the auxiliary sound box should be selected. The high and low speakers can also be made into speaker groups to extend the frequency response range.
(4) When arranging the speakers, it is necessary to achieve a uniform and sufficient sound level. If a single (point) speaker cannot meet the needs, multiple points can be set, so that each listener can get almost the same sound loudness, improve the The clarity of the sound; a good sense of orientation, the speaker should be installed more than 3 meters above the ground, so that the audience can "see" the speaker, and try to make the horizontal hearing (sound source)-visual (speaker) as far as possible Consistent, and the distance between the two speakers should not be too large.
(5) Electric horn-type speakers must be put on the horn before they can be used, otherwise it is easy to damage the sound head.
(6) When two or more speakers are used together, attention must be paid to the phase problem. If it is reversed, the sound will be significantly attenuated. The easiest way to measure the phase of the speaker is to use the high-sensitivity meter head or the 50~250μA current block of the multimeter, connect the test meter to the wiring head of the speaker, hold the paper cone with both hands, and push it hard. direction to determine their phase. If the phases are the same, the hands swing in one direction. At this time, the voice coil lead connected to the positive test pen can be regarded as the "ten" level.