[Kai Tuo small knowledge] tell you how many amplifiers are connected to the processor!!
[Abstract] how many amplifiers are connected to an output channel of the processor is reasonable? What is the significance of output impedance and input impedance in audio system link? How to match is reasonable?
In project design or application, we often encounter a very practical problem: the number of processor output channels is small, while the number of power amplifiers is large, so the hardware between processor output and power amplifier input can not be connected one by one. If the active signal distributor is configured, it will determine the safety and sound dynamic quality of the whole system.
The signal link output port of the power amplifier is in parallel with the input port in the power amplifier. Therefore, the link port of the power amplifier is used to connect the next power amplifier, which also belongs to the signal parallel structure. Can one output channel of the processor be connected to multiple amplifiers? It is necessary to know the output impedance of the processor and the input impedance of the power amplifier. As long as the relationship of input impedance value ≥ output impedance value X10 times is satisfied!
Qt-dsp240, qituo digital audio processor
The impedance of the output channel of a processor is 600 Ω, and the input impedance of the power amplifier is 10000 Ω (10K Ω).
If two power amplifiers are connected in parallel (input impedance is 5000 Ω) to an output channel (600 Ω) of the processor, the input impedance value (5000 Ω) is less than 10 times the output impedance value (6000 Ω). The conclusion is that only one power amplifier can be connected to one output channel of this processor.
The impedance of the output channel of a processor is 200 Ω, and the input impedance of the power amplifier is 10000 Ω (10K Ω).
If five power amplifiers are connected in parallel (input impedance is 2000 Ω) to an output channel (200 Ω) of the processor, the system satisfies that the input impedance value (2000 Ω) is equal to the output impedance value X10 times (2000 Ω). The conclusion is that one output channel of this processor can connect five power amplifiers.
Qt-ms350 digital network professional power amplifier of qituo
[summary] the matching characteristic that the resistance between the output impedance and the input impedance is more than 10 times, which is applicable to the matching of all devices in the audio link, including the microphone at the front end and the speaker at the end. Therefore, the output of the front-end device can connect several input devices, which depends on the output input impedance of the device, rather than experience.