Focus Us On

Classification of Commercial Power Amplifier

In accordance with the different amplifier tube conductive modes, there are different types about the commercial power amplifier: the first-class amplifier (also known as class A), the second-class amplifier (also known as class B), the first-second-class amplifier (also known as class AB) and the fourth-class amplifier (also known as class D).

The first-class amplifier refers to the commercial power amplifier of which any power output element will not be cut-off current (namely stop output) during entire signal cycle (plus or minus two and a half cycles of the sine wave). When the first-class amplifier is operating, it will produce high heat with low efficiency. However, its inherent advantage is that there is no crossover distortion. The mono-amplifier is the first-class amplifier while the push-pull amplifier can be the first class, or the second class or the first-second class.

The second-class amplifier refers to the amplifier of which the plus or minus two and a half cycles of sine signal are outputted and amplified respectively and alternately by two "arms" of the push-pull output stage. And the conductive time of each "arm" is half a cycle of the signals. The advantage of the second-class amplifier is that it has high efficiency and its disadvantage is that it will produce crossover distortion.

The first-second-class amplifier is between the first class and the second class. And the conduction time for each "arm" of push-pull amplification is more than half a period of signal and less than one cycle. The first-second-class amplifier can effectively solve the crossover distortion problem of the second-class amplifier, and it is more efficient than the first-class amplifier, so it has been widely used.

The fourth-class amplifier is also known as the digital amplifier, which can amplify the audio signal by the extremely high-frequency conversion switch circuit. The amplifier features high efficiency and small volume. There are many fourth-class amplifiers of which power are more than 1,000W but they are just as big as VHS tapes. This type of amplifier is not suitable for use as the broadband amplifier, but there are more applications in active subwoofer.

Commercial Power Amplifier
Related News
  • The Advantages of Phonograph Pre AMP Amplifier

    The Advantages of Phonograph Pre AMP Amplifier

    June 22, 2018Phonograph Pre AMP Amplifier (also known as cartridge amplifier, hereinafter referred to as "phono preamp") is a front-end amplifier between phonograph and combined-type power amplifier (or front/back...view
  • The Working Principle of PA Speaker

    The Working Principle of PA Speaker

    June 22, 2018By the current control action of triode or the voltage control action of field effect tube, PA can convert the power of the power supply to the current which varies according to the input signal. Beca...view
  • Hybrid Phonograph Preamplifier Nagra VPS

    Hybrid Phonograph Preamplifier Nagra VPS

    June 22, 2018Feature 1: different equalization methods are realized by jumperNagra VPS provides two equalization methods: RIAA 1953 and IEC 1976. The jumper is set through the first level of each channel. If the j...view
  • Why Choose RH AUDIO Multi Zone Mixer Amplifier

    Why Choose RH AUDIO Multi Zone Mixer Amplifier

    May 29, 2018■ Hybrid amplifier with single or dual zone from 30W to 120W■ The balance input of 4 low-noise microphone or line■ Optional priority and sound control switches in the microphone input 1■ Optional ...view
  • Difference Between Mixer Digital Amplifier and Digital Public Address Amplifier

    Difference Between Mixer Digital Amplifier and Digital Public Address Amplifier

    May 15, 2018Amplifier, its full name is the power amplifier. As the name suggests, amplifier is to amplify the power. The power amplifier belongs to the post stage amplifier, and its function is to enlarge the si...view
  • Background of the Class D Amplifier

    Background of the Class D Amplifier

    May 29, 2018In 1958, the Class D Amplifier was first proposed. And in recent years, it has become more and more popular.The Class D Amplifier is designed to produce the input audio signal (with real, efficient an...view
  • TEL:+86-20-39388220
  • FAX:+86 20 31072811
  • EMAIL:info@rh-audio.net
  • ADDRESS:Floor 6, Building J, Kaida Industrial Park, Shixin Road, Xinshuikeng Village, Panyu District, Guangzhou China.