How Professional Amplifiers Work and Classification

Professional Amplifiers refer to amplifiers that can produce the maximum power output to drive a load (such as a speaker) under a given distortion rate. Professional Amplifiers play a pivotal role in the "organization and coordination" of the entire audio system, and to some extent determine whether the entire system can provide good sound quality output.

Here is the content list:

• How Professional Amplifiers Work

• Classification of Professional Amplifiers

• Possible cause of damage

How Professional Amplifiers Work

Professional Amplifiers use the current control function of the triode or the voltage control function of the FET to convert the power of the power supply into a current that changes according to the input signal. Because the sound is a wave of different amplitude and frequency, that is, the AC signal current, the collector current of the triode is always β times the base current in the amplification area, and β is the current amplification factor of the triode. Applying this point, if a small signal is injected into the base, the current flowing through the collector will be equal to β times the base current. Then this signal is isolated with a DC blocking capacitor, and a large signal with a current (or voltage) that is β times the original is obtained. This phenomenon becomes the amplification effect of the triode. After continuous current amplification, the power amplification of Professional Amplifiers is completed.

Classification of Professional Amplifiers

A traditional digital voice playback system consists of two main processes:

1. Conversion of digital voice data to analog voice signal (using high-precision digital-to-analog converter DAC);

2. Use analog Professional Amplifiers to amplify analog signals. Since the early 1980s, many researchers have worked to develop different types of digital amplifiers that amplify power directly from digital voice data without analog conversion. Such amplifiers are often referred to as digital power amplifiers.

According to the voltage and current when the transistor is in the amplified state (that is, the position of the static operating point of the transistor), Professional Amplifiers can be divided into ClassA, ClassB, ClassAB, ClassC, and ClassD.

Possible cause of damage

One of them is the unreasonable combination of the power amplifier and speaker. Second, because the speaker is overloaded for a long time, the voice coil of the speaker is overheated and the contacts are blown or even burnt. Because under normal working conditions, if the temperature of the voice coil is too high, the voice coil will inevitably be burned out.

Third, it is caused by the user's low technical quality and improper operation. Especially due to the extremely harsh whistle produced by the returned gun, many accidents damage the tweeter. Fourth, it is damage caused by "strong vibration". For example, when a very large power is sent to the speaker or there is a sudden strong impact signal, it will cause a "strong vibration" in the speaker, causing the cone to break, and the voice coil to separate from the magnetic gap and scatter.

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