Hebei stage machinery on the principle of stage sound collocation

Release time:

2019-08-21

Summary： In the field of professional sound reinforcement, the configuration of audio equipment is very elegant, of which the configuration of power amplifier and speaker is the most important. Although the instructions for use of some speaker products recommend the specific brand or model of the power amplifier to the user, there are still limitations, because users often face many models of power amplifier and have no way to start.

As we all know, when we watch the stage performance, in addition to the stage lighting, the more important thing is the stage sound. So how the stage sound collocation can make the sound get better effect! Follow Hebei stage machinery to see it!

In the field of professional sound reinforcement, the configuration of audio equipment is very elegant, of which the configuration of power amplifier and speaker is the most important. Although the instructions for use of some speaker products recommend the specific brand or model of the power amplifier to the user, there are still limitations, because users often face many models of power amplifier and have no way to start.

There are many aspects involved in the configuration of power amplifiers and speakers, such as the power amplifier brand, the choice of power tube type, and which power amplifier should be configured for low-sensitivity speakers. The specific configuration of power amplifiers and speakers is generally related to the experience, hobbies, listening habits and other factors of designers, and it is difficult to find a unified standard. Sometimes we will encounter some users or designers in order to save money often to the speaker configuration smaller power amplifier, some users in order to the so-called "sufficient power reserve" to the speaker configuration very high power amplifier. Obviously, this is inappropriate. Importantly, this configuration can cause damage to the device. In the power amplifier and speaker configuration, the power of the power amplifier is indeed the key, that is to say, the principle of determining the power of the power amplifier should be unified.

As we all know, after the acoustic design of the hall, 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 selected to achieve the best match?

Within the 20Hz ~ 20kHz of the human auditory domain, music signals that really concentrate a lot of energy are generally in the middle, low and frequency bands, while the energy of the high frequency band is only 1/10 of the energy of the middle and low frequency bands. Therefore, the power lost by the high-pitched sound of the general speaker is much lower than that of the woofer, so as to achieve high-pitched and low-pitched balance. The power amplifier is like a current modulator. Under the control of its input audio signal, it outputs currents of different sizes to the sound box to make the power amplifier with a nominal power of 200W reach 400W or several times the output under certain impedance conditions, only the distortion (THD) of the power amplifier will be greatly increased. This distortion is mainly generated in the high-frequency harmonics in the medium and low frequency signals. The greater the distortion, the greater the energy of the high-frequency harmonics. These high-frequency distortion signals will enter the tweeter head together with the high-frequency music signal. This is why the tweeter head will burn when the small power amplifier pushes the large sound box. In many people's concept, as long as the power amplifier is large, it is possible to burn the speaker. Although some power amplifiers have no distortion indication, due to the congenitally insufficient equipment configuration, distortion may occur from time to time in use, and then the distortion indication has lost its meaning. Moreover, due to the limitation of the user's experience and quality, the distortion of the power amplifier is often easily ignored.

The power configuration of the amplifier and the speaker also has a certain relationship with the target loudness and the use of the occasion. Under a certain target loudness, the dynamics of the music signal should be fully guaranteed on each piece of equipment. If the power of the power amplifier is too large and its gain is set very small, the loudness has reached the requirements, but then the gain of the power amplifier limits the dynamic range of the signal. Therefore, the power of the amplifier should not be too large; otherwise, since the waste of expenditure, it will bring about the trouble of loudness and music dynamics that cannot be taken into account and the speaker is overloaded. According to past experience, there is a difference between general language, music amplification venues and large dynamic discos. There are general amplifying places with small signal fluctuation and no need for power amplifiers to provide large current to speakers for a long time or very quickly, so the power of power amplifiers should be smaller than that of large dynamic amplifying places requiring strong power. In addition, the so-called "power reserve" should also be aimed at sound boxes. It is worth noting that the selection of power amplifiers must be determined by sound boxes, and the concept of "power reserve" should not be used to configure power amplifiers. In other words, under a certain target loudness, the speaker can be larger than the design value for different purposes, and the power of the amplifier should be strictly determined by the speaker, without much flexibility.

The specific standard of power amplifier and speaker power configuration should be: under certain impedance conditions, the power amplifier power should be greater than the speaker power, but not too large. In general, the non-distortion rate of the amplifier should be about 1.2-1.5 times the rated power of the speaker, while in large dynamic situations it should be about 1.5-2 times. According to this standard for configuration, since it can ensure that the power amplifier works in the best condition and the safety of the sound box, even for inexperienced operators, as long as it is not a serious error in operation or improper adjustment of the front-stage peripheral equipment, the sound box and the power amplifier can work in a stable state.

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Hebei professional audio teaches you to change the sound quality

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Hebei professional audio teaches you to change the sound quality

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