The Function of Power Amplifier in Sound System

In the field of multimedia speakers, the concept of independent power amplifier first appeared in 2002. After a period of market cultivation, in 2005 and 2006, the new design idea of this multimedia speaker has been widely recognized by consumers. Major speaker manufacturers have also introduced new 2.1 speakers designed with independent power amplifier, thus setting off wave after wave of "independent power amplifier" panic buying boom. In fact, from the sound quality of the speaker, it will not be greatly improved because of the design of the independent power amplifier. The independent power amplifier can only effectively reduce the influence of electromagnetic interference on the sound quality, and is not enough to cause a considerable improvement in the sound quality. Nevertheless, the independent power amplifier design still has many advantages that ordinary 2.1 multimedia speakers do not have:

First of all, the independent power amplifier has no built-in volume limitation, so it can achieve better heat dissipation effect. Ordinary built-in power amplifier speakers, because they are sealed in a wooden box with poor thermal conductivity, can only be dissipated through the convection of the inverted tube. For independent power amplifiers, although the power amplifier circuit is also sealed in a box, but because the power amplifier box is not like a sound box, there is no sealing requirement, so a large number of heat dissipation holes can be opened at the location of the heating component, so that the heat can be quickly dissipated through natural convection. This is particularly important for high power amplifiers.

Again, the built-in power amplifier speaker, because the air in the box is in non-stop vibration, resulting in the PCB version of the amplifier and electronic components resonance, and the vibration of the capacitor and other components will be played back to the sound, resulting in noise. In addition, the speaker will also produce electromagnetic effects, even if it is a full anti-magnetic horn, it will inevitably leak magnetic flux, especially the huge woofer. Circuit board, IC and other electronic components sell the influence of magnetic leakage, will interfere with the current in the circuit, resulting in interference current sound.

In addition, the independent amplifier design of the speaker due to the use of the amplifier box control, to a large extent, the liberation of the placement of the low sound box, saving valuable desktop space.

Having said so many advantages of independent power amplifiers, it is actually summed up in one sentence-if the size, price and other reasons are not considered, and only from the perspective of use effect, then independent power amplifiers are better than the design of built-in power amplifiers.

Secondly, from the aspect of power amplifier, independent power amplifier is beneficial to the design of circuit. Ordinary speakers for volume, stability and many other factors, the circuit design is very compact, it is difficult to optimize the circuit arrangement. The independent power amplifier, due to the independent power amplifier box, has sufficient space, so the circuit design can be all from the needs of electrical design, without the interference of objective factors. Independent power amplifier is beneficial to the stability of the circuit.

Again, the built-in power amplifier speaker, because the air in the box is in non-stop vibration, resulting in the PCB version of the amplifier and electronic components resonance, and the vibration of the capacitor and other components will be played back to the sound, resulting in noise. In addition, the speaker will also produce electromagnetic effects, even if it is a full anti-magnetic horn, it will inevitably leak magnetic flux, especially the huge woofer. Circuit board, IC and other electronic components sell the influence of magnetic leakage, will interfere with the current in the circuit, resulting in interference current sound.

In addition, the independent amplifier design of the speaker due to the use of the amplifier box control, to a large extent, the liberation of the placement of the low sound box, saving valuable desktop space.

Having said so many advantages of independent power amplifiers, it is actually summed up in one sentence-if the size, price and other reasons are not considered, and only from the perspective of use effect, then independent power amplifiers are better than the design of built-in power amplifiers.