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2.1 audio speaker selection guide
Oct 07, 2017

2.1 speaker crossover design, if it is to be the main speaker and satellite speakers sound unit designed as a full band speakers, so since there is only one speaker, theoretically playback frequency range of 20 hz to 20 KHZ, but is hard to do in the actual application, this may result in alto full enough. But the design of the satellite speakers in this design is mostly small and beautiful.

And there's a crossover design in the main speaker and satellite speakers to use the high frequency speaker speaker unit and the collocation of a bass speaker in the unit, which can make the low, medium and high three parts have good performance, but the appearance of this kind of speakers generally don't look good. One, the speaker is the soul
The speaker is a key part of the entire speaker, like a singer's voice, which directly affects the quality of the speaker.

First, talk about speakers. The speaker of the multimedia speaker can be divided into four categories: high frequency loudspeaker, medium frequency speaker, low frequency speaker and full band speaker. According to the structure, it can be divided into three categories: cone speaker, ball top speaker and plate speaker.
The sound principle of flat speakers is not quite the same as that of other speakers, and it is not sound quality. At present, the medium and low-end speakers are mostly cone structures, as shown in fig.1, and 2.1 speakers are mainly used in speakers.

To put it simply, the speaker of the 2.1 speakers mainly depends on the caliber and diaphragm type. 2.1 speakers are speakers of low-standard products, the diameter size is usually a high unit with 1 inch, alto unit with three inches, in the class by 5 inches 6.5 inches even do the bass unit, those products should be done better. And then the diaphragm. The diaphragm is composed of many materials, such as fiber paper, wool, PP basin (polypropylene compound basin), etc. Different materials can show different vocal personalities, but no grades.

The woollen basin is mixed with wool fiber, but the tone is warm and gentle in the big dynamic color, and the performance is not good. Therefore, the preference is to listen to music, human voice and other works. Since the paper basin and the PP basin have the best adaptability, the tone color is moderate, can grasp the balance in strength and grace. In addition to its low cost, it is the most common in the 2.1 speakers.

In addition, different material basin sides have some influence on the vibration characteristics of the diaphragm. More common basin edge has paper edge, cloth edge, rubber edge. The sensitivity of the edge and edge of the paper is high, suitable for high frequency performance; The paper is used for the bass unit to soften the bass, but the stroke will be shorter. Summary: knowing the personality of the speaker, you can first introduce the exhibits or information by looking at the exhibits or information, and simply master the sound characteristics of the speakers. 2. The box is music space
Let's listen to music to pay attention to the space layout of music environment. Similarly, the box will need a music space for the speaker. The design, material and process of the box space will affect the resonance and effect.

The boxes of the speakers are of two types: wood and plastic. Now in low price wooden speakers are mostly use Micronesia board as casing material, and USES mostly high real pure wood material as enclosure, to avoid the resonance and sealing box, guarantee case the thickness of the board, board combined with the close degree between are the key factors that affect quality.

Choose wooden box body, first depends on the outer layer of the speaker, whether there are obvious blister, scratches and so on, the seam is neat. As shown in fig.2, the wooden case is better in workmanship and smooth in line. Carefully distinguish between casing material quality, if can't tell from the joint, can be in in the cavity wall by hand knock, if plate thicker, high density, sound should be low and no obvious hollow ring.
Select the plastic case to see whether the plastic products are rough, such as whether the tube wall is thick, whether the surface is smooth or not. Then we need to uncover the dust cover and watch the production process of the speaker. This includes: the manufacturing process and the fixed speaker screws in the center of the loudspeaker.

Turn the volume button to 3/4 to check the seal of the box. Use your hand to touch around the speaker. If the wind blows out after feeling the box, it will be inaccurate.
Summary: by looking at the box, you can understand the basic quality of the speakers. Even the box does not make the sound box, the other place of the speaker can not be very good.
Power supply is the backing of the speaker
The power parts of the speakers are also important. It includes the transformer part, the amplifier part, the line input part.

Line input includes power line input and signal line input. It is mainly to see whether the signal line and the power line are separated into the line, which is that the signal line and the power line are entered from the upper part of the box respectively, and cannot be squeezed together. Otherwise, the electromagnetic wave of the power cord will cause greater interference to the signal line. In addition, the signal line USES the lotus interface, which also reduces the signal input loss. As shown in FIG. 3, the power cord of this speaker is entered from the lower part of the box, while the signal line is connected from the upper part of the box body.
The speaker is an active speaker, an important feature is that it has a built-in amplifier circuit. However, the power of the transformer directly affects the power output of the active speaker, only the power of sufficient size can supply the amplifier and the speaker unit.

The amplifier chip in the amplifier part affects the quality of the sound of active speakers. The quality of the former amplifier is far greater than the latter, especially in the sound direction and music texture.
A power amplifier is usually called a amplifier, which is the rear amplifier of the speaker. Its mission is simply to magnify the power so that it can drive the speaker, and the combination of the amplifier and the speaker is often referred to as the rear amplifier circuit.
Summary: although the internal structure of the speakers is not visible during the purchase, it is a good chance to see this part. In the computer city, there are also sometimes merchants showing the chip models of the amplifier. Iv. Necessary speaker terminology

It is not good to choose the speaker without reading the instruction manual, because it can understand the weight of the speaker, the size of the appearance, the accessories, whether the speaker has the anti-magnetism, and can also know the performance index of the speaker. Some of the main terms associated with the sound box should be understood, not just by the merchant.
Rated output power (RMS) : the effective power, refers to the frequency characteristics and harmonic distortion coefficients in the amplifier can meet the technical indicators, the power amplifier can continuous sine wave output signal power. Because the degree of distortion is not uniform, this index can only be used as a reference.

Sensitivity: an indicator of a speaker that has nothing to do with the sound quality and timbre of the speaker. The sensitivity of ordinary speakers is generally between 85dB and 90dB, and the higher the sensitivity, the easier it is to be pushed, and the lower the power requirement of the amplifier.

Dynamic range: the difference between the strongest and weakest parts of the signal. It shows the ability of the speaker to deal with weak signals. The wider the dynamic range, the easier it is to hear the details of music