How to achieve excellent sound effect under high power?

　　Many people think that professional audio is very complex and prone to mistakes, especially in large-scale song and dance performances, important conference sound reinforcement, etc. Even experienced sound engineers will make mistakes after encountering important people to explain.

　　However, this kind of difficulty is only one aspect of the problem. For most sound engineers, the difficulty is nothing more than a little knowledge of the so-called professional sound: measuring the power of the speakers with a "multimeter", or adjusting the loudness of the venue with a "sound pressure meter". Leaders think that they are very professional, but they feel uncomfortable facing the microphone.

　　In this way, we need to correct some basic conceptual mistakes. Before we identify past mistakes, let's start with a concept: professional audio is not equal to home audio. There is an essential difference between the two! All our discussions are within the scope of professional audio. More specifically, we only discuss sound reinforcement under high power.

　　Another difference between professional audio and civil speakers is in the bass. The bass of civil speakers is heard, while the bass of professional speakers is felt. What is feeling? It is the vibration of the air. It is conveyed to us. We feel the air waves. This feeling is very special. Like underwater, we hear many sounds by feeling. In order to feel this bass, the requirements for the box are particularly high.

　　In order to achieve excellent sound effects under high power, we should focus on:

　　The first is box vibration. Because the box vibration will counteract the sound pressure at a specific frequency, causing distortion; The other kind of box is damaged by vibration. It can emit specific geometric noise, which is like the sound of two boards hitting each other.

　　Of course, this kind of noise is caused by the wood board and its production process. For example, the wood board is easy to deform/the production process is backward/the wood board is not straight when it is sawn into small pieces, resulting in zigzag shape, which can not be completely uniform in the gluing process, and later noise occurs.

　　The second is unit resonance. Due to different unit structures, why use aluminum basin frame? There is nothing special under low power. Under high power, due to the effect of sound waves, the surface of the speaker will vibrate more or less. (Of course, the ideal speaker design should not feel vibration at any part of the speaker under high power.) This vibration will be transmitted back to the unit fixed on it. At this time, if the frame of the unit speaker is not firm enough, the subwoofer frame will also vibrate with the panel at the same time. At this time, the central position of the voice coil in the magnetic fluid will be damaged, It causes serious distortion, even friction ring, and rear voice coil burning.

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