音響設備根據使用要求進行設計，選擇要使用的設備，將這些單獨的設備按照設計要求進行連接和配置。對于固定安裝系統，設備需要安裝在機柜內，所有系統連接都需要按照特定的標準和標準進行固定安裝。那么音響系統信號傳輸時的阻抗匹配和信號傳輸電平有怎樣的相關內容呢？
The audio equipment shall be designed according to the use requirements, the equipment to be used shall be selected, and these separate equipment shall be connected and configured according to the design requirements. For the fixed installation system, the equipment needs to be installed in the cabinet, and all system connections need to be fixed installed according to specific standards and standards. So what is the correlation between impedance matching and signal transmission level of sound system signal transmission?
1.阻抗匹配。
1. impedance matching.
信號輸入端口是信號輸出端口上的負載，需要滿足的阻抗匹配程度通常取決于信號輸出器件的設計要求。為了優化音頻信號的傳輸狀態，信號輸入接口的阻抗需要滿足信號源輸出接口與負載的阻抗匹配要求。否則會影響音響設備的工作狀態，輸出信號會失真。
The signal input port is the load on the signal output port, and the impedance matching degree to be met usually depends on the design requirements of the signal output device. In order to optimize the transmission state of audio signal, the impedance of signal input interface needs to meet the impedance matching requirements of signal source output interface and load. Otherwise, the working state of the audio equipment will be affected and the output signal will be distorted.
嚴重時有損壞聲源設備的風險。理論上，當輸出阻抗等于負載阻抗時，信號傳輸效率高。輸出阻抗大于負載阻抗，大部分信號功率損失在信號輸出電路中，顯然不利于信號傳輸。
There is a risk of damaging the sound source equipment in serious cases. Theoretically, when the output impedance is equal to the load impedance, the signal transmission efficiency is high. The output impedance is greater than the load impedance, and most of the signal power loss is in the signal output circuit, which is obviously not conducive to signal transmission.
因此，音頻設備通常設計為輸入阻抗大于輸出阻抗。一般來說，如果負載阻抗大于信號輸出的阻抗，音頻設備的連接就會正常工作。但是，音頻設備的輸入阻抗不能設計得太高或太低。過高會降低饋線性能，過低會降低頻率指標。
Therefore, audio equipment is usually designed with input impedance greater than output impedance. Generally speaking, if the load impedance is greater than the impedance of the signal output, the connection of the audio equipment will work normally. However, the input impedance of audio equipment should not be designed too high or too low. Too high will reduce the feeder performance, and too low will reduce the frequency index.
2.信號傳輸電平。
2. signal transmission level.
山東音響設備連接的目的是傳輸信號。音頻信號傳輸良好的條件是信號源的輸出電平需要大于輸入接口的靈敏度，否則信噪比指標會變差。音頻設備上的線路輸入和輸出電路的增益通常很平衡。換句話說，設備在輸出過程中不會放大或衰減輸入或輸出信號電平并保持電平值。主要檢查液位控制裝置的調整。
The purpose of Shandong professional audio equipment connection is to transmit signals. A good condition for audio signal transmission is that the output level of the signal source needs to be greater than the sensitivity of the input interface, otherwise the signal-to-noise ratio index will become worse. The gain of line input and output circuits on audio equipment is usually balanced. In other words, the device will not amplify or attenuate the input or output signal level and maintain the level value during the output process. Mainly check the adjustment of liquid level control device.
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