The direct sound is the sound that is emitted from the speaker and reaches the listener directly. Its main characteristic is that the sound is pure, that is, what kind of sound is emitted by the speaker, the listener hears almost what kind of sound, and the direct sound does not pass through the room reflection of the wall, the ground and the top surface, does not have any defects caused by the sound reflection of the interior decoration materials, and it is not affected by the indoor acoustic environment. Therefore, the sound quality is guaranteed and the sound fidelity is high. A very important principle in modern room acoustics design is to make full use of the direct sound from the speakers in the listening area and control the reflected sound as much as possible. In a room, the method to determine whether the listening area can obtain the direct sound from all speakers is very simple, generally using the visual method. In the listening area, if the person in the listening area can see the whole of all the speakers, and is located in the area where all the speakers are cross-radiated, the direct sound of the speakers can be obtained.

Under normal circumstances, speaker suspension is the best solution for direct sound in a room, but sometimes due to the low layer spacing and limited space in the room, the suspension speaker may be subject to certain restrictions. If possible, It is recommended to hang up the speakers.

The horn pointing angle of many speakers is within 60 degrees, the horizontal pointing angle is large, the vertical angle directivity is small, if the listening area is not within the horn’s directivity angle, the direct sound of the horn cannot be obtained, so when the speakers are placed horizontally, the axis of the tweeter should be consistent with the level of the listener’s ears. When the speaker is hung up, the key is to adjust tilt angle of the speakers to avoid affecting the treble listening effect.

When the speaker is playing, the closer to the speaker, the greater the proportion of direct sound in the sound, and the smaller the proportion of reflected sound; the farther away from the speaker, the smaller the proportion of direct sound.