On the position, width and depth of the sound field

People who have been exposed to audio should have heard the word "sound field" more or less. What kind of concept is "sound field"? In the United States where fever music originated, 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 position and shape of the band on the stage, including length, width, and height. It is a concept of a three-dimensional space, and the "sound stage" we refer to is actually "Sound Stage", because if you put " "Sound Stage" literally translates to "sound stage" or "sound stage". As for "Sound Field", it actually corresponds to the "space sense" we introduced earlier. Therefore, when we refer to "the shape of the sound field", it actually refers to the shape of the band that your equipment reproduces. Due to the uneven distribution of the frequency response curve and the directivity of the speaker (such as the width of the room is greater than the depth or the depth is greater than the width), the sound field broadcast by the sound is actually more or less different from the original recording situation . Some sound fields are originally box-shaped, and there are no bulges. Of course, the different shapes of the sound field stage can not match the original situation when recording. There is a noteworthy problem: when performing live, the band arrangement is wider than the depth; but in the studio, in order to produce sound effects, the arrangement of the orchestra often changes, usually the length will be elongated, especially percussion instruments Will go further. This is not the arrangement we saw in the concert hall.

"Position of the sound field"

The position of the sound field should include the front, back, high and low of the sound field. Some equipment that is not properly matched makes the entire sound field sound like it is floating in mid-air; some sounds like it is sitting on the second floor of the concert hall and watching the stage. There are many reasons for the position of the sound field, such as the positioning of the speaker and the uneven frequency response. What should an ideal sound field position be? We can experience it by listening to a symphony orchestra. When the symphony orchestra is playing, the sound of double bass and cello should be emitted from a relatively low place. The position of the violin is slightly higher than that of double bass and cello; when recording, the orchestra should be low front and high, like brass instruments Most likely in a higher position. For the height of the entire sound field, we can use the following method to determine, the height of the sound field 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. The copper pipe must be at least as high or higher as the violin. So where should the front and back positions of the sound field be? Experienced audiophiles know that a straight line should be drawn on the front panel of the speaker and then extend back a distance. Of course, this optimal sound field position cannot be achieved, because it has a great relationship with your audio collocation, listening environment and the software being played. Generally speaking, it is easier to extend from the front panel of the speaker, but it cannot be "retracted" too much. If there is too much retreat, as some enthusiasts say, it is wrong to "go straight to the street".

"Width of sound field"

Sometimes we often hear enthusiasts boast: "My sound field is not just beyond the speaker, it can even break through the wall." This sentence is illusory to laymen. For experienced friends, it's just a little exaggerated. Usually, in the performance of popular music, you can occasionally hear an instrument ringing outside the speaker; and when playing classical music, you often feel that the width of the orchestra has exceeded the width between the two speakers, which is beyond the speaker, Widely reach the side wall. Many audiophiles have this experience and do not have to spend much time talking. As for breaking out of the wall, I'm afraid it depends on a little imagination. At least, the position of the sound field that can be seen with imaginary eyes is the real sound field. We ca n’t see anything outside the wall, and it ’s hard to be sure that it is there. Therefore, the width of the sound field is actually only within the wall. You can feel this feeling from the 1812 overture just now. If you hear the 1812 overture, the sound is constricted in the middle of the two speakers without exceeding the sides of the speaker, then you'd better ask an experienced audiophile to diagnose your audio and see if something is wrong there .

"Depth of Sound Field"

"Depth of sound field" is what we often say "deep sense". "Depth sense" is different from "level sense" and "position sense", because the level and positioning have little relationship with the sound field, but the sense of depth still belongs to The range of the sound field. Like the "width of the sound field", many people would say that the depth of the sound field of his house has already broken through the wall and reached the street. This is of course only an adjective of self-satisfaction. The true "depth of the sound field" refers to the distance between the first line instrument and the last line instrument 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 next door, deep to cross the street" This should be included in the "space sense", this issue needs to be discussed in the future. Some equipments or environments have too many mid-low frequencies or low frequencies, so the bass drum and timpani will move forward. At this time, the depth of the sound field is of course very poor. Conversely, the position of some sound fields is retracted, and the result is mistaken for the sound field to be very deep. In fact, that is wrong. I do n’t think you ’ve ever seen a band line up in a vertical bar. As long as you grasp the concept of the distance between violin and timpani and bass drum, you will be able to accurately say the depth of the sound field.

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