Selection of Professional Amplifiers

Professional Amplifiers In terms of their main use, power amplifiers can be divided into two main categories, namely dedicated power amplifiers and civilian power amplifiers. Power amplifiers used in stadiums, movie theaters, dance halls, conference halls, sound reinforcement in public places, and recording monitors generally have some unique requirements on their technical parameters. a power amplifier or professional power amplifier.

Here is the content list:

• Linear power amplifier and push-pull amplifier circuit

• Buying Tips for Professional Amplifiers

Linear power amplifier and push-pull amplifier circuit

Linear power amplifiers are used on occasions requiring small nonlinear distortion. Commonly used circuit forms include single-tube amplifier circuits and push-pull amplifier circuits. The circuit form of the single-tube amplifier circuit is similar to that of a voltage amplifier. It must work in Class A with the lowest efficiency and is mostly used for low-power power amplifiers. The push-pull amplifier circuit consists of two active devices, which are respectively excited by input signals with a phase difference of 180°, and then their output signals are superimposed in the antiphase and supplied to the load. Theoretically, the two devices of this circuit can work in Class B without distortion in the output. However, the actual characteristics of active devices are not completely ideal, and they need to work in Class A and B. The push-pull amplifier circuit can also be composed of complementary pairs of transistors with opposite polarities (CPNP type and NPN type bipolar transistor pairs or N-type channel and P-type channel field effect transistor pairs). The circuit composed of their complementary characteristics does not need two input signals with a phase difference of 180°, and the output signal does not need to be reversed and superimposed. This kind of circuit can be composed entirely of transistors and resistors, which are easy to integrate and are mostly used in integrated power amplifiers.

Buying Tips for Professional Amplifiers

When choosing a power amplifier, we must first pay attention to some of its technical indicators:

1. Input impedance: usually indicates the anti-interference ability of the power amplifier, generally in the range of 5000-15000Ω, the larger the value, the stronger the anti-interference ability;

2. Distortion degree: refers to the degree of distortion of the output signal compared with the input signal, the smaller the value, the better the quality, generally below 0.05%;

3. Signal-to-noise ratio: refers to the ratio between the music signal and the noise signal in the output signal. The larger the value, the cleaner the sound.

In addition, when purchasing Professional Amplifiers, it is necessary to clarify the purchase intention. If you want a Subwoofer amplifier, it is best to buy a 5-channel power amplifier. Usually, 2-channel and 4-channel speakers can only drive the front and rear speakers, while the subwoofer can only be equipped with an additional power amplifier, and a 5-channel power amplifier can solve this problem. The output power of the power amplifier should also be greater than the rated power of the speaker.

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