Audio HiFi Knowledge | Space Acoustics

                       Audio HiFi Knowledge | Space Acoustics

When we listen to music in the listening room, whether the music is good or not is affected by at least the following factors:

First, the advantages and disadvantages of the equipment itself and whether it is appropriate or not.

Second, the location of the speaker.

3. The position of the listener.

Fourth, the proportion of listening space.

Five, the processing of space.

Sixth, the skill of overall adjustment.

All of these factors are very important, and the lack of any of them will lead to a great reduction in the sound of millions of audio equipment. Among them, various acoustic responses related to space are most unknown to audio fans.

Before talking about space acoustics, there is one more fact to let everyone know.

That is our headphones are usually not golden ears.

Because although the bandwidth of most equipment is set at 20Hz-20kHz, the period when the human ear can hear 20kHz is probably in childhood, and it will drop to 16kHz after the age of 20.

Generally speaking, the average person is most sensitive to the sound of 2000-4000Hz, and the sensitivity will be reduced if it goes up or down.

First of all, we need to know that sound has three elements.

That is the strength of the sound, the pitch of the pitch, and the difference in timbre.

The strength of the sound is expressed in dB, and the pitch is expressed in Hz. As for the timbre, it cannot be displayed in any unit. But do you all know what the tone is? For example, when I talk about the timbre of the violin and the timbre of the trumpet, their timbre will emerge in everyone's mind.

Likewise, in space acoustics, you know that every room responds differently to sound waves, and therefore produces a different room tone, just like everyone's voice is different.

People have voice prints, and each indoor space also has its own unique voice prints, so even if a set of identical audio equipment is placed in two different spaces, the sound performance heard by the human ear will be completely different .

The voiceprint of a space is affected by many factors.

The first factor is the proportional shape of the space.

Since the ratio and shape of length, width and height will cause different standing wave accumulations in the room, the room will be filled with various sound wave structures of peaks and troughs, which is an important factor in the formation of indoor space soundprints. Since listening to audio is usually in a small space, the impact of standing waves is even greater.

It is almost impossible to remove all kinds of standing waves in a small space. The only effective way to deal with standing waves is the placement of the speakers and the listening position of the listener.

The second important factor is the distortion of the interior space.

Spatial distortion includes at least:

1. The complex interaction between speaker placement and listening position combined with the spatial standing wave shape must be overcome by adjusting the speaker placement and listening position.

2. The various sound wave reflections and interferences produced by the six indoor space boundaries (walls) on the speakers, that is, the mutual combination and interference of direct sound and reflected sound. We can use different sound wave diffusion and absorption to reduce the influence of the boundary, and the quadratic residue diffuser is a very effective tool.

3. The direct sound and reflected sound emitted by the aforementioned speakers will combine or cancel each other, which is called spatial comb filter. To reduce the side effects of comb filter, the most effective way is to let the indoor sound waves diffuse and absorb evenly. The same Various related processing is also required.

Fourth, the diffusion state of various sound waves, that is, the reflection of sound waves in different directions produced by various furniture and decorations in the room. In this regard, ready-made furniture or layout can be used to make the sound space look comfortable and have actual sound effects.

Different audio-visual performances represent the different sizes of musical instruments and human voices, whether the audio-image is cohesive or not, the position of the audio-image in the sound field, the width, depth, and height of the audio-image, and so on.

The so-called different deep impressions refer to our feelings about the sound characteristics of the whole set of audio equipment. For example, we feel that the mid-frequency of this set of audio equipment is particularly full. Or there is a lot of sense of low frequency volume. No matter what kind of audio equipment is placed in this space, it will have the same strong impression, which is the sound impression given by spatial distortion.

To deal with the influence of standing waves in indoor space, in addition to the careful selection of speaker placement and listening position, an appropriate space ratio of length, width and height is also very important, because an appropriate space ratio will minimize the intensity of standing waves and reduce the Effects of standing waves on listening to music. To reduce the impact of spatial distortion on listening to music, it depends on the processing of space and fine-tuning of space.