2, the airflow subwoofer can use the ground reflection airflow speaker is the speaker that does not directly radiate the sound of the speaker. According to technical terms, it is a speaker that the speaker diaphragm (tray) is not directly coupled with air. In the field of professional audio, airflow speakers are generally subwoofers. The modern airflow subwoofer uses advanced aerodynamics to achieve a strong airflow change with a large diaphragm vibration that can only be produced by the bass, and this airflow change enhances the bass. The airflow subwoofer not only makes the bass farther due to aerodynamic characteristics, but also makes the bass more pleasing due to its excellent acoustic characteristics. The airflow subwoofer can be easily identified from the outside. It is a speaker with the back of the woofer facing outwards, facing inward (reverse) or not directly visible on the front of the woofer. The most common speaker is currently in the speaker. There are two types of Tibetan subwoofers and speaker reverse-type subwoofers (eg TAS DP-215B, TANBO TX-2180, DEBOS D-180). They mainly rely on the airflow characteristics of sound propagation, continuously send out a group of bass airflows to the space, and use the airflow group to propagate sound waves instead of transmitting sound energy to the air by simple wave radiation characteristics, and the bass can travel farther. Airflow subwoofers are relatively free to place and install, either hanging in the air or directly on the ground. But in general, it is better to put the airflow subwoofer on the ground. This is because the airflow subwoofer uses airflow, so the bass has a certain directivity, even if there is acoustic radiation, but even if there is acoustic radiation, The proportion of acoustic radiation is also small, so the reflected sound content after reaching the reflective interface is also small, and the bass reflection volume is moderate. The subwoofer is placed directly on the ground, which can fully exert the effect of the ground, which is equivalent to extending the ground as a bass horn. Such a large bass horn makes the sound resistance of the lower limit frequency of the speaker more closely match, and the bass sounds thicker and fuller. .
3, listening to the area to fully obtain the direct sound of the speaker direct sound is from the speaker directly to the listener's voice, its main feature is pure tone, that is, what kind of sound is emitted by the speaker, the listener heard almost What kind of voice is it. The direct sound does not pass through the wall, the ground and the top surface of the room. There is no acoustic defect caused by the reflection of the interior decoration material. It is also not affected by the indoor acoustic environment, so the sound quality is guaranteed and the sound fidelity is guaranteed. high. An important principle in modern room acoustic design is that the listening area makes full use of the direct sound from the speakers and tries to control the reflected sound. As far as a room is concerned, the method of determining whether the listening area can obtain the direct sound from all the speakers is very simple, and the visual method can be used. In the listening area, if the listener can see the whole of all the speakers, and in the area where all the speakers share the cross radiation, the speaker can be heard directly. Under normal circumstances, speaker hanging is the best way to get direct sound in the room, but sometimes due to the low floor space and limited space, hanging speakers may be subject to certain restrictions. If conditions permit, it is best to hang the speaker. hang up. Many speakers have a horn pointing angle of 60 degrees or less. The horizontal direction is large, and the vertical direction is small. If the listening area is not within the horn of the horn, the horn of the horn cannot be obtained, so the speaker is placed horizontally. The tweeter axis should be consistent with the level of the listener's ear. When the speaker is hung, adjust the tilt angle to avoid affecting the high-pitched sound. When the speaker is playing, the closer to the speaker, the greater the proportion of direct sound in the sound, and the smaller the ratio of reflected sound; the farther away from the speaker, the smaller the proportion of direct sound.
4. The speaker is placed symmetrically with the central axis of the room. The requirement for the indoor acoustic environment is that the symmetry of the building must be consistent with the acoustic symmetry of the room. The speaker should be placed at a symmetrical position on the central axis of the room. Only by achieving the consistency of architectural symmetry and acoustic symmetry can an ideal, harmonious and symmetrical sound field be provided for the interior. If the speaker is placed asymmetrically with the room, that is, the two speakers are biased to one side of the room, there are many problems in playback. Although these problems can be compensated by electroacoustic compensation, the most Well, you should try to avoid a series of problems caused by the asymmetry of placement. Some rooms themselves are asymmetric internal structures or decoration structures. The room acoustics are already asymmetrical. The speaker placement can only make the sound field symmetrical as much as possible. So, what problems will the sound field asymmetry cause? Let's analyze it below: When using the effector to add effects to the sound, you will find that the reverb sound effect of the speaker farther away from the wall is more obvious than that of the speaker closer to the wall. This is because the front of the speaker is farther from the wall. The volume of the sound reproduction space is large. According to the theory that the larger the reverberation time is, the reverberation is stronger. The space in front of the speaker closer to the wall is smaller, and the reverberation is definitely weaker. An important requirement of the acoustic characteristics of the hall is to create a uniform sound field. That is, the volume of each position in the sound field cannot be too different. If the sound field is not uniform, the consistency of the volume and the tone of the listening area will be deteriorated. When the speaker is placed asymmetrically, it will cause less reflection of the early reflection sound of the speaker facing the larger space, smaller volume, and the effect of the early reflection sound of the speaker facing the smaller space, and the volume is large. The sound field uniformity is destroyed.
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