Guangzhou DSPPA Audio Co., Ltd.

Configuration Solution of Public Address Amplifier and Speaker (II)

As we all know, after the auditorium acoustical design, it is necessary to determine the power of the speaker according to a series of calculations, and then the power of the amplifier is determined by the power of the speaker. But how can the power of the two be matched?

Firstly, within the range of 20 Hz to 20 kHz, the music signals that really concentrate a large amount of energy are generally in the middle, low and frequency bands, while the energy in the high-frequency band is only 1/10 of the energy in the middle and low-frequency bands. So, the power loss of the woofer than treble speakers is much lower, in order to balance the high bass. A power amplifier is like a current modulator, which, under the control of its input audio signal, outputs different currents to the speaker to produce different sizes of sound. Under certain impedance conditions, it is easy to make the output of the amplifier with a nominal power of 200 W reach 400 W or several times, but the distortion (THD) of the amplifier will increase greatly. This distortion mainly produces high-frequency harmonics in the medium and low-frequency signals. The greater the distortion, the higher the high-frequency harmonic energy. These high-frequency distortion signals will enter the high-pitch head together with the high-frequency music signals. This is why the high-pitch head burns when the small power amplifier pushes the loudspeaker. In many people's concepts, as long as the power amplifier is high, it is possible to burn the speaker. Although some power amplifiers have no distortion indication, because the equipment configuration is congenitally inadequate, distortion may occur from time to time in use, at this time, the distortion indication has lost its significance. Moreover, due to the limitation of the user's experience and quality, the distortion of the power amplifier is often neglected.

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