Discuss professional audio technology.Bar special audio Vendor

　　However, this kind of difficulty is only one side of the problem. For most sound engineers, the most difficult thing is to have a little understanding of the so-called professional audio: use a "multimeter" to measure the power of the speakers, or use a "sound pressure meter" to adjust the loudness of the venue, etc. Waiting, the leader thought they knew the profession very well, but it was uncomfortable to speak into the microphone.

　　In this way, we have to correct some basic conceptual errors. Before determining the past errors, let us correct one concept: professional audio is not equal to home audio. There is a fundamental difference between the two! All our discussions are in the scope of professional audio. More specifically, we only discuss the situation of sound reinforcement under high power.

　　Another difference between professional speakers and civilian speakers is the bass. The bass of the civilian box can be heard, while the bass of the professional box is felt. What is a feeling? It is the vibration of the air, which is transmitted to us. We feel the waves of air. This feeling is very special. Just like underwater, we actually hear a lot of sounds by feeling. To feel this kind of bass, the requirements for the cabinet are particularly high.

　　Under high power, to achieve excellent sound effects, we must focus on solving:

　　One is Hakata Zhen. Because the box vibration will cancel out the sound pressure of a specific frequency, causing distortion; another box vibration is the worst, it can emit specific geometric noise, this noise is like the sound of two wooden boards hitting each other. Of course, this noise is caused by the wood board and the production process. For example, the wood board is easy to be deformed/the production process is backward/the wood board is not straight when sawed from a large piece to a small piece, but appears jagged, which causes the gluing process to not be completely uniform. , And there was subsequent noise.

　　The second is unit resonance. Because of the different unit structure, why use aluminum frame? There is nothing special under low power. Under high power, due to the effect of sound waves, vibration will occur on the surface of the speaker. If the speaker frame is not strong enough, the bass frame will vibrate with the panel at the same time. At this time, the center position of the voice coil in the magnetic fluid will be damaged, causing serious distortion and even scratching. Loop, and finally the voice coil burns.

　　In order to reduce costs, some manufacturers use very thin iron plates as the speaker frame, and the quality of the speakers is not good. This is also one of the reasons. Usually, the thickness of the iron plate used in the speaker frame of 150WRMS power cannot be less than 1.2mm. Of course, the aluminum frame is better, because the frame of the aluminum frame is cast rather than stamped, so its geometric deformation is much smaller than that of the stamped iron frame.

　　The third is the sound source, the so-called sound source. Many times when we go to the dance hall, the bass bass we hear is completely different from the recording CD. This is not because the dance hall sound is not good, (of course, there are indeed bad) but the sound source is wrong, specifically, the radio method is wrong. Many years ago, we have coached on-site radio skills, how to pick up the bass drum sound? The characteristics of bass Bass radio and so on. Here we just want to say that if you can't feel good bass in the dance hall, the first reaction is whether the DJ has been coached, and you should not doubt the quality of the speakers used.

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When buying a stage audio amplifier, pay attention to these points so as not to suffer a loss.High-e