A Popular New Interpretation of Speaker Power Amplifier Technology

Although the use of metal backplanes and external heat sinks can solve the problem of heat dissipation of power amplifier chips, the heat dissipation problems of heat-generating components such as transformers cannot be solved. For the independent power amplifier, although the power amplifier circuit is also sealed in the box, because the power amplifier box is not like a speaker, there is no sealing requirement, so a large number of cooling holes can be opened at the position of the heating components, so that the heat can pass through natural convection. Diverging quickly, of course, the choice of high-quality extruded aluminum profiles to make the power amplifier enclosurehas been the choice of many customers with strong heat dissipation, durability and corrosion resistance, which is particularly important for high-power power amplifiers.

From the aspect of power amplifier, independent power amplifier is beneficial to circuit design. For speakers with built-in power amplifiers, because the power is placed in the box, for reasons such as volume and stability, the circuit design is as compact as possible, and the circuit arrangement is also very strange. Often the optimal circuit arrangement cannot be achieved. The independent power amplifier has sufficient space due to the independent power amplifier box, so the circuit design can be based on the needs of electrical design without interference from objective factors.

The independent power amplifier is beneficial to the stable performance of the circuit. The working environment of the built-in power amplifier is very harsh. The air in the box is constantly vibrating. These vibrating air will push the pcb board and electronic components of the power amplifier to also vibrate slightly, and the vibration of capacitors and other components will cause vibration. An amplification effect is generated, which is reflected in the playback sound, and the friction between the air and electronic components, especially the fine circuit pins, will also produce friction sound, which will cause noise in the playback sound.

 Moreover, in addition to the influence of mechanical vibration, the speaker will also have an electromagnetic influence on the power amplifier circuit. Even if it is an anti-magnetic speaker, it is impossible to absolutely avoid the slight magnetic leakage, especially the huge woofer. The magnetic flux leakage of the speaker will have a complex interaction with the power supply, ic and other components of the power amplifier circuit, thereby causing interference to the current in the power amplifier circuit, and this interference will also be amplified by the power amplifier circuit, resulting in interfering current sound.

 As for the speaker and the speaker? Due to the acoustic design of the speaker, it is actually designed based on the bare box. However, after adding the built-in power amplifier, the actual volume of the box becomes smaller. For speakers whose circuits are designed in the left and right channel speakers, the built-in power amplifier also makes the left and right channel boxes actually asymmetrical in acoustics. This difference must be reflected in the effect of sound playback. With independent power amplifiers, there is no such problem. Moreover, the independent power amplifier also reduces the possibility of air leakage in the cabinet because there is no need to open extra holes on the cabinet.

 We look at the independent power amplifier products in the hi-fi field, and they all give full play to the advantages of the independent power amplifier itself in design. Generally speaking, in these power amplifiers, the large volume in the casing is used to isolate the strong electrical equipment such as transformers and weak equipment such as signal circuits, and the main power circuits and their heat sinks are placed in the entire power amplifier. The best place in the enclosure to ventilate and dissipate heat. In this way, it is fully guaranteed that each circuit part can be in the best working condition. And this is what the built-in power amplifier circuit can't do.

These are the reasons for using independent power amplifiers. However, on this basis, because of the convenient independent power amplifier box, it has the conditions to add functions that the built-in power amplifier circuit cannot support. And this is the most obvious advantage of the independent power amplifier we have seen - the most obvious advantage of the independent power amplifier is that the control becomes convenient. For ordinary built-in amplifier speakers, switches, volume knobs, etc. Are generally placed at the rear of the speakers (although there are side or front designs, but they often affect the sound quality of the speakers), especially x.1 speakers, it is only possible to put these things on the subwoofer on the ground, which is of course very inconvenient to use.

Although some speakers use in-line control or design the controller on one of the left and right channels, the functions that can be provided are also limited.

When the power amplifier is placed externally, since there is an independent power  amplifier box, switches, knobs, etc. Can be placed on the power amplifier box, which is quite convenient to use. At the same time, because of this, more abundant adjustment functions can be provided without being restricted by the manipulation conditions. Not only that, in the field of hi-fi and av, a large number of other functions are generally added to the power amplifier, such as radio, decoding, multi-input and even dsp sound processing and so on. These are not the reasons for the independence of the power amplifier, but they are indeed the places where the advantages of independent power amplifiers are maximized.

After talking about the advantages of so many independent power amplifiers, it is actually summed up in one sentence - if you do not consider the size, price and other reasons, but only from the perspective of use effect, then the independent power amplifier is better than the design of the built-in power amplifier. Because of this, in the fields of hi-fi and av, except for a few devices such as monitoring equipment that have extremely high requirements on the consistency of power amplifiers, the design of independent power amplifiers is basically adopted.

However, compared to the popularity of the hi-fi field, in the multimedia field, the design of independent power amplifiers is rare.

On the surface, this seems to be because hi-fi power amplifiers use complex discrete component circuit designs, while most multimedia products use relatively simple integrated circuit power amplifier modules. But in fact, this is not the reason for whether it is an independent power amplifier.

It does not mean that putting the power amplifier in an external box is a true independent power amplifier. This can only be called "External", but to say "Independent", there should be more design factors.

Earlier, we introduced the advantages of independent power amplifiers. As an independent power amplifier, since it costs more to separate the power amplifiers, of course, we should give full play to the advantages of independent power amplifiers according to the design concept of independent power amplifiers. It is necessary to make a targeted design according to the structure of the independent power amplifier. It is necessary to take advantage of the circuit volume and controllability of the independent power amplifier to provide richer functions that the built-in power amplifier cannot provide. Only in this way can the cost of the power amplifier be paid independently.

Simply transplanting the standard built-in power amplifier circuit into the external box is also an external power amplifier design, but since it is no different from the built-in power amplifier in terms of electrical structure, it is only beneficial to facilitate adjustment and reduce mechanical and electromagnetic interference. Can not play all the advantages of external power amplifier, this is just a "External", but can not be said to be a typical "Independent power amplifier".

The circuit is designed according to the structure of the external box, so that the power amplifier module has the best mechanical structure and heat dissipation support. At the same time, using the large space brought by the external box, it provides many functions such as remote control, segment adjustment, multi-signal input, equal loudness, amp, etc., which makes the independent power amplifier box have the functions of a complete home appliance power amplifier. Therefore, it is no longer an "Accessory" Of the speaker, but a  mini power amplifier product that can be used independently from the original speaker. Yongucase has a variety of power amplifier enclosures to choose from, and professional structural designers can solve your circuit board needs.

"External power amplifier" In the traditional sense is still an integral part of multimedia speakers. The weak power, lack of function, and innate structural deficiencies caused by the built-in power amplifier make the power amplifier external, but it is still a speaker. Appendices lack both the value of independent use and the ability to be used independently. The hifi series upgrades the "External power amplifier" To a true "Independent" Power amplifier. The powerful functions and expandable structure make the hifi power amplifier not only can be used with the speakers of this series, but also has a powerful upgrade matching ability.

The future multimedia independent power amplifier will not just be an "External power amplifier" That moves the built-in power amplifier circuit to the external box, but will be like a hi-fi power amplifier, with rich functions, powerful driving capabilities and a true "Stand-alone" Amplifier with flexible collocation. Come and choose yongucase's power amplifier shell, so that your power amplifier can be more perfect.