An output channel of the processor,
How many amplifiers are connected and reasonable?
In the audio system link,
What is the significance of output impedance and input impedance?
How to match is reasonable?
A very practical problem is often encountered in project design or application:
The number of processor output channels is small, and the number of power amplifiers is large. The hardware between the processor output and the power amplifier input cannot be connected one by one. If an active signal splitter is configured, the active signal splitter will determine the security and sound dynamics of the entire system.
Can one output channel of the processor be connected to multiple amplifiers?
The signal LINK output port of the power amplifier is connected in parallel with the input port inside the power amplifier. Therefore, the LINK port of the power amplifier is used to connect to the next power amplifier, which is also a signal parallel structure.
Can one output channel of the processor be connected to multiple amplifiers? This requires understanding what the output impedance of the processor is and what the input impedance of the amplifier is.
Science
Input impedance output impedance (Is it both?)
越 The smaller the output impedance, the stronger the ability to drive the next stage: if the output voltage is constant, the smaller the output impedance, the larger the drive current generated, so the drive capability is stronger.
越大 The larger the input impedance, the easier it is to drive: When the input voltage is constant, the larger the input impedance is, the smaller the current allowed to be driven is, so it is easy to be driven.
So~
As long as the input impedance value ≥ output impedance value X10 times is satisfied, this relationship can be ~( ̄▽ ̄)~!
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Example
The impedance of one processor output channel is 600Ω, and the input impedance of the amplifier is 10000Ω (10KΩ).
If two power amplifiers are connected in parallel (input impedance is 5000Ω) connected to one output channel (600Ω) of the processor, the input impedance value (5000Ω) is less than the output impedance value X10 times (6000Ω). The conclusion is that only one amplifier can be connected to one output channel of this processor.
The impedance of one processor output channel is 200Ω, and the input impedance of the amplifier is 10000Ω (10KΩ).
If five power amplifiers are connected in parallel (input impedance is 2000Ω) connected to one output channel (200Ω) of the processor, the system meets the input impedance value (2000Ω) equal to the output impedance value X10 times (2000Ω). The conclusion is that this processor can connect five amplifiers with one output channel.
in conclusion
Summary: The matching characteristics of the output impedance and the input impedance maintain a relationship of more than 10 times, suitable for matching all devices in the audio link, including the microphone at the front end and the speaker at the end. Therefore, the front-end device output can connect several input devices, depending on the output impedance of the device, not the experience.
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