What Is The Sound Field?

- Jun 19, 2018-

In the United States, the birthplace of fever music, there are two words related to the sound field, one is "Sound Field" and the other is "Sound Stage". "Sound Stage" mainly refers to the arrangement and shape of the band on the stage, including the length, width and height. It is a concept of three-dimensional space. The "sound stage" we mean is actually the "Sound Stage" because if we take " "Sound Stage" literally translates into "stage of sound" or "listening soundtrack". This really does not make people literate. As for the "Sound Field", it actually corresponds to the "spatial sense" we introduced before. Therefore, when we refer to the "shape of the sound field", it actually refers to the shape of the bands that your equipment reproduces. Due to the uneven distribution of frequency response curves and speaker directivity (such as the width of the room is greater than the depth or depth is greater than the width), the sound field broadcasted by the sound is actually more or less different from the original recording situation. . Some of the sound field shapes are originally boxy and have no arches. The different shapes of this stage of the sound stage cannot, of course, be in conformity with the original form when recording. There is a problem worth noting: in live performances, the band is arranged to have a width greater than the depth; but in the studio, in order to produce acoustic effects, the arrangement of the orchestra tends to change, often stretching in depth, especially percussion will be farther away. This is not the arrangement we see in the concert hall.


Position of Sound Field

The position of the sound field should include the front, rear, height, and low of the sound field. Mismatches with certain equipment can make the whole sound field sound like floating in the air; some sound like sitting on the second floor of the concert hall to watch the stage. There are many reasons for forming the position of the sound field, such as the setting of the speaker and the uneven frequency response. What should be an ideal sound field location? We can use a method of listening to a symphony band. When the symphony orchestra is played, the sound of the double bass and the cello should be sent from a relatively low place. The position of the violin is slightly higher than that of the double bass and the cello; when the recording is performed; the orchestra should be low and high, like a brass instrument, most likely at a higher position. For the height of the entire sound field, we can use the following method to determine, the sound field height should be slightly lower than the height of your eyes when you sit. In other words, the violin should be above the line of sight, and the cello and double bass should be below the line of sight. Copper tubes must be at least as high as or higher than the violin. So where should the front and rear of the sound field be located? Senior fans know that they should draw a straight line on the front panel of the speaker and then extend back a distance. Of course, this optimal sound field position is not achievable, because it has a great relationship with your audio mix, listening environment and the software being played. In general, it's easier to extend backwards from the front panel of the speaker, but you can't "shrink" too much. If you shrink too much, as some enthusiasts say, it's not right to go straight to the street.


Width of Sound Field

Sometimes we can often hear enthusiasts boasting: "My sound field is not just beyond the speakers, it can even break out of the wall." This sentence is heard by amateurs and is simply a fantasy. For experienced friends, it is only a little exaggeration. Usually, in the performance of popular music, you can occasionally hear the sound of an instrument coming out of the speaker; when playing classical music, you often feel that the width of the orchestra exceeds the width between the two speakers, which is beyond the speaker, Wide wall. Many enthusiasts have this experience and do not have to spend too much time. As for breaking out of the wall, I am afraid we must rely on a little imagination. At the very least, the position of the sound field that can be seen with the imaginary eyes is the real sound field. We cannot see anything outside the wall. We can hardly know where it is. Therefore, the width of the sound field is actually only within the walls.


Depth of Sound Field

"The depth of the sound field" is what we often call the "deep sense". The "deep sense" is different from the "layer sense" and the "positioning sense". Because the level and orientation have little relationship with the sound field, the sense of depth still belongs to The range of the sound field. As with "the width of the sound field," many people would say that the depth of the sound field in his house had already broken through the wall and went deep into the street. Of course, this is just an adjective for self-fulfillment. The true "field depth" refers to the distance between the front line instruments and the last line instruments in the sound field. In other words, it most likely refers to the distance between the violin and the bass drum and timpani. "Wide to neighbors and deep in the street" should be included in the "sense of space." This issue is yet to be discussed in the future. Some equipment or environments have too many low-mid frequencies or low frequencies, so bass drums and fixed-tone agitation positions will be higher. At this time, the depth of the sound field is certainly poor. Conversely, some of the sound fields are set back, and the result is mistaken for the depth of the sound field. In fact, that is wrong. I think you haven't seen a band line up in a vertical bar. You just have to grasp the concept of "the distance between the violin to the timpani and the drum," and you will be able to accurately describe the depth of the sound field.



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