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Diaphragm-the key to sound quality of speakers

2021-09-29 37
Some speakers have very good sound quality, without losing the sound, and have a high degree of reduction, while others have a different sound quality, with distortion, low reduction, and even broken sound. So what determines the sound quality of the audio? How do we judge the sound quality of a speaker?

According to research, the sound quality of the speaker depends on three indicators of the diaphragm material: material elasticity (E), density (ρ) and appropriate internal damping. When we usually say that the sound quality is good, it means that the internal damping is large, and E/ρ (the quotient of material elasticity and density) should also be large.

The damping is large, it can filter out unnecessary clutter, the vibration stops (the sound is from there to not) quickly, and the sound is clean and soft. For example, the rigid alloy diaphragm has high elasticity, low density, and relatively large E/ρ, but the metal damping is small, it is more difficult for the sound to stop quickly, and the sound is not very clean. :
On the contrary, pulp-based materials have large damping and soft sound. The sound rises (sound from scratch) is relatively slow, and the decline speed is relatively fast, but the strength is not enough.

Therefore, it is very difficult to satisfy E/ρ at the same time and the internal damping is large enough.

Therefore, the use of different diaphragm materials, the performance of the speaker is not the same. What are the main materials of the woofer diaphragm that we usually use? How about its sound performance? Before the introduction of the network editor of the Zhengzhou Second-hand Audio Recycling Company, Yueshengxiang, we will first popularize a concept: frequency response.

Frequency response refers to the speaker's ability to respond to and discriminate the input signal together. For example, in general, the frequency response of a good speaker should be 20Hz to 20000Hz. When a 20Hz-20000Hz audio signal enters the speaker, the output The music will have enough low-frequency dive and very good high-frequency performance.

When a 5Hz-25000Hz audio signal enters this speaker, the signal speakers above and below the frequency response range of this speaker cannot handle it. At this time, we feel that the music is very narrow and lacks expressiveness.


Diaphragm-the key to sound quality of speakers


The smaller the frequency response (frequency response) value, the flatter the frequency response curve of the speaker, the smaller the distortion, and the better the performance.

There are many types of woofer diaphragms, including aluminum alloy diaphragm, aluminum-magnesium alloy diaphragm, ceramic diaphragm, carbon fiber diaphragm, bulletproof cloth diaphragm, glass fiber diaphragm, acrylic diaphragm, paper diaphragm, etc. The structure is mostly cone type, and a few of them are flat type.

Zhengzhou Second-hand Audio Recycling Company, the network editor of Yueshengxiang, here mainly introduce four kinds.

Paper cone: The paper cone should be regarded as the oldest speaker material. It is to inject the pulp fluid into the designed basin-shaped net mold. When the pulp is deposited to a certain thickness, it is copied out, and then processed after drying. A cone diaphragm is formed.

Because the paper cone contains a lot of fiber, the audio is easily absorbed when it is transmitted, that is, it forms a good damping.

In terms of sense of hearing, the paper cone sounds natural and full of bass.

But the shortcomings are also obvious: poor moisture resistance, the paper becomes denser and less rigid after absorbing moisture, and after a long period of dry and wet cycles, the paper cone material itself will fatigue. Secondly, it is difficult to control consistency during manufacturing.

Wool Woven Basin: As the word implies, softer wool fibers are infiltrated into the paper cone pulp of the woofer. The advantages of this are obvious: it performs very well for soft and light music, and has a mellow and natural voice.

But the shortcomings are also more prominent: the bass effect is average, lack of strength and shock, so the performance of rock music and marches is unsatisfactory.

If you usually listen to light music more and don't pay much attention to the bass effect of the speakers, the wool woven basin is your best choice.

Bulletproof cloth bowl: Bulletproof cloth usually also has a rubber edge or foam edge, which will make the bass effect of the speaker better, the frequency response is wider, the sound is more three-dimensional, and it can withstand greater power. So it is suitable for big dynamic music.

But in general, its cost is relatively high, the manufacturing process is complicated, and it performs poorly when playing light music.
 
If you are a game fan and like strong bass music, bulletproof cloth basin is a pretty good choice.

PP (polypropylene) basin: PP basin mainly refers to plastic diaphragm. It refers to the cone basin formed by plastic injection molding or other methods. The most contacted polypropylene in daily life is microwave oven containers and fresh-keeping boxes. .

From these materials, we can see that the polypropylene material is very strong, so the audio signal will be quickly absorbed and consumed when it is transmitted. In summary, the damping characteristic is very good. In the sense of hearing, the distortion is low, and the performance is remarkable in all aspects. It is widely popular in high-end speakers.

Of course, there is no perfect person. Although it has similar low damping characteristics to the paper cone, the pp cone has insufficient rigidity and the mass is relatively large.

After reading these four main diaphragm materials, I believe you will be more targeted when choosing your favorite speakers, rather than just relying on intuitive feelings to judge.

Now you know how to look at the sound quality of speakers
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