Gain is one of the main indicators of the power amplifier. It is the product of the direction coefficient and efficiency, and it is the performance of the antenna radiation or the size of the received electric wave. The choice of gain size depends on the requirements of the system design for the radio wave coverage area. Simply put, under the same conditions, the higher the gain, the farther the radio wave propagation distance will be. The larger the receiving gain value of the power amplifier, the stronger the receiving performance.

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.

Strictly speaking, the power index of the power amplifier is divided into the nominal output power and the maximum instantaneous output power. The former is the rated output power, which can be interpreted as the maximum output power when the harmonic distortion changes within the standard range and can work safely for a long time. The latter refers to the "peak" output power of the power amplifier, which is interpreted as the maximum output power that the power amplifier can withstand instantaneously under the premise of ensuring that the signal is not damaged when the power amplifier accepts an electrical signal input.

To make a reasonable configuration between Professional Amplifiers and speakers, in general, the output power of the power amplifier should be 1.5-2 times the rated power of the speakers. For example, if the rated power of the speaker is 200w, the output power of the Professional Amplifiers should not be lower than 300-400w. Such a configuration can not only ensure that the sound will not be distorted, but also reduce the possibility of speaker damage.

Both AV amplifiers and Hi-Fi power amplifiers have very strict requirements on Professional Amplifiers and have clear requirements in terms of output power, frequency response, distortion, signal-to-noise ratio, output impedance, and damping coefficient.

Professional Amplifiers and speakers must pay attention to two problems when matching, one is impedance matching, and the other is power matching. If the two are matched reasonably and accurately, this can not only ensure the high-quality reproduction of the speaker sound without distortion, and give people a beautiful enjoyment, but also ensure the safety of the speaker. On the contrary, it will not achieve a good sound effect, and it is easy to damage the speaker, especially the tweeter of the speaker.