Signal Input Mode Of Power Amplifier

- Jul 11, 2018-

Regarding the signal input mode selection problem of the power amplifier. In professional audio engineering, problems such as signal parallelism and bridging are often encountered. First, the meaning of selecting the corresponding mode must be clearly understood. There is usually a toggle or spring button switch on the back panel of the power amplifier. The switch is marked with a mode name in English. The three modes are: STEREO (stereo, ie two in and two out), PARALLEL (parallel , that is, one in and two out), BRIDGE (bridge, that is, one in and one out). Specifically, when the number of speakers is large and the same audio signal is needed, the PARALLEL mode may be used; when the speaker power is large and the power amplifier single channel power is small, BRIDGE may be used). When selecting the mode, it is recommended to repeatedly toggle the toggle switch several times while the power amplifier is off, or press the spring button switch several times to ensure that the mode is set correctly.

Another point to be reminded is that in some projects, many power amplifiers are used, and the audio processor can use fewer output channels, even without an audio processor, so that the output interface of the mixer or audio source device The number of requirements is high, but the number of output interfaces available is actually very limited. There are two main solutions that many friends are accustomed to: 1. One-point multi-signal line is used to distribute the signal of one output interface to the input channels of multiple power amplifiers. 2. Input one signal or main signal to one power amplifier, each power amplifier is set to signal parallel mode (the signal input interface of some power amplifiers is designed with signal parallel output interface), and then the signals are sequentially connected by hand. Parallel to the next stage (since the audio signal parallel function of most power amplifiers is only mechanical circuit switching, the signal processing circuit is not designed, which is essentially the same as the one-minute method).

It is not unreasonable to adopt a one-minute method. This is a very practical and common practice in practical engineering applications, but the problem is that you don't want to divide as much as you can, because it involves input and output impedance matching with audio equipment. Factor-related, usually one output terminal signal of the audio processor can divide up to three signals. This data is a reference value based on the input-output impedance matching relationship of most audio devices. It is not an absolute value. It should be calculated according to specifically configured.

 

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