It can be expressed by frequency response curve, and the test circuit measures the response of a power amplifier. According to the frequency doubling relationship, it is increased from 1Hz to 100kHz point by point. The frequency band between two frequency points where the output voltage level at the low end and the high end of the curve drops by 3dB is the passband of the amplifier. At this time, the passband inhomogeneity can also be displayed intuitively from the curve.

The response of power amplifier refers to the passband width of amplifier at rated output voltage or power state, which is usually expressed by frequency response curve. When testing the circuit, keep the rated output voltage measured above unchanged, and then change the frequency of the signal generator.

Power amplifier function

Power amplifier, referred to as power amplifier, generally refers to one of the most basic devices in audio system, commonly known as amplifier. Its task is to amplify the professional audio system from the signal source and the weak electrical signal from the mixer, and drive the speaker to make sound. It can also refer to other devices used for power amplification.

The function of the power amplifier is to amplify the weak signal from the sound source or preamplifier and push the speaker to make sound. A good set of audio system power amplifier plays an important role.

Power amplifier is the largest family of all kinds of audio equipment. Its main function is to amplify the weak signal input by audio equipment and generate enough current to drive the speaker to play back the sound. Considering the differences in power, impedance, distortion, dynamics, application scope and control and adjustment functions, different power amplifiers have different internal signal processing, circuit design and production technology.