【 Weak current College 】 speaker selection of questions and answers-Power By 【 China power house network 】

Speakers from which parts»

All kinds of speaker on the market, however, both of which are operated by driver (terminology called speaker units) and two box-the most basic components, in addition, the vast majority of speakers at least two or two above driver implements the so-called multiple-tone playback, so the divider is also an integral part of the essential. Of course, the speakers also may have versamat, down-tube, the collapse of the "labyrinth channel", rebar/strengthen separators, etc other parts, but these parts are not any one speaker is essential, the speaker of the most basic element only three parts: the driver, Cabinet and dividers.

Why do some speakers with two driver, and you want to use three, four, five, with one row?

Driver from electro-acoustic energy transform function will the reactive power broadcasting to an electrical signal is converted to sound output, is the most critical part of the speaker, speaker of the performance indicators and sound performance, greatly depends on the driver's performance and, therefore, a prerequisite for making good speaker is the selection of performance excellent driver. On driver performance requirements can be summed up the main hosting power, frequency response and low distortion, wide, transient response, high sensitivity, but several aspects to 20Hz-20KHZ so wide-frequency bands at the same time a good balance between distortion and transient, power and performance is very difficult, as the road police, if the pipe is too wide and would eventually and the tube period is much easier, the driver also is the reason that the most effective solution is to split band replay. The trumpet plant produces different types of units, is responsible only for playing bass, called bass unit, playing Alto called Alto unit, treble unit only plays the treble, so you can take a targeted design, the performance of each unit are doing better.

Therefore, although you can use a wide band loudspeaker to design speaker, but for the above reasons, using a combination of multiple units to cover the entire audio band design or account for the vast majority. Specific use several units, depending on the audio frequency range Division, if simply siding treble and bass (or low) two Horn is enough; if you are into high, medium, low three paragraphs of three frequency speaker, then at least have three units, now two low frequency units parallel work of design patterns is also very popular, so that the total number of cells it may reach four; some large speaker band Division more fine, if you return to the design of parallel work unit, the total number of the driver will be more. In the speaker information or instructions usually have "x" X road, this is the way to the speaker of the frequency and the total number of used cells for specific instructions, such as the "three-way Quad unit", indicates that this is a three-frequency design of loudspeaker, the total spent four driver, and so on.

DEBUG comments: this is the new sea-famous Mr works for getting started. Top speakers, but there is only one full-band units, in fact, if the full-frequency unit really able to do so, it's many advantages is not a multiple unit speaker can be compared. But the whole band speakers are indeed a few hundred of thousands or even hundreds of thousands of everywhere, also not very rare, but just a few top it is very difficult to make it more difficult to do. So we are very rare.

Divider is what?

Because almost all of the speakers now use more cell division band replay of design patterns, so you must have a device capable of power broadcasting to the whole band music signals as needed into the treble, bass or treble, Alto, bass, to keep the appropriate driver to connect, the divider is a device. If you put the whole frequency band signal not assigned directly into the high, mid, bass unit, in addition to the frequency response range of the section "extra signal" on normal in-band signals has a negative impact on the reduction or even make the treble, Alto cell damage. From the circuit structure, the divider is essentially by the capacitor and the inductor coil form of LC filter network, treble channel is high-pass filter, it only allows high-frequency signal through and stop this low-frequency bass channel signal; just think back, it only makes bass through this high-frequency signal which resistance; audio channel is a bandpass filter, in addition to a low a high two crossover point between frequency can, high-frequency components and low frequency components will be blocked. In the actual divider, sometimes in order to balance high, bass unit sensitivity disparity between, also joined the decay resistance; in addition, some divider also joined by the resistance, capacitance compensation network consisting of impedance, and its purpose is to enable speaker impedance curve flattened, so that the power amplifier driven.

Driver what kind?

Driver of many types, classification methods vary. If you press the electric-acoustic transformation of principle, have the cone cells, flat panel unit, ball unit, the type of belt unit, etc, including Cone and plate unit more suitable to do the treble, some audio unit adopts qiudingshi design; from the spectrum covered, but also brought about some audio unit adopts qiudingshi design; from the coverage of frequency brings, driver can be divided into cells, tenor bass, treble unit cell and the whole band unit.

The most common bass and baritone unit from the conversion of the principle of speaking are electric speakers, their use of cone-shaped diaphragm, which shapes ripening of diaphragm design, good performance. Diaphragm material is varied, traditional paper diaphragm, a polymer composite material (such as Poly-Vinyl) production of diaphragm, aluminium, magnesium and other metal materials produced by the diaphragm. The requirements of the diaphragm is a good rigidity (difficult to produce segmentation vibration), lightweight (good transient response), with the appropriate internal damping characteristics (inhibits resonance), but these are not easy to satisfy. Paper diaphragm light weight but strong rigid enough; rigid metal diaphragm is very good, but also poor; polymer damping for two with diaphragm more effectively all aspects of our gu, has in recent years for a number of applications. In addition, some manufacturers use a very complex process diaphragm, "Sandwich "composite structure is one of the top and bottom surfaces with honeycomb structure between the middle tier, on the whole, has high rigidity, as well as a light weight, good damping characteristics, a fever.

Treble unit most commonly used is qiudingshi treble, from works, also belongs to electric units. Ball of diaphragm can be used to high-pitched metallic materials (such as aluminum, titanium, beryllium and so on), known as a hard ball, you can also use soft fabric manufacturing (such as silk, linen), known as the soft ball, in General, hard ball in high-frequency response is better, but the sound of soft ball meek. In recent years, the band treble and electrostatic treble also received some of the applications, which together have the advantage of a special lightness and diaphragm-frequency response, sound thin transparent, however, both the treble is not as good as the production of ball treble so easy, not too popular. application There is also a clarion call of the treble, the drivers by qiudingshi part a horn-shaped Horn, it features a sound point to strong, and efficient, thus in the area of professional PA speaker system is widespread in the application. There is also a coaxial units, in fact, the bass and treble unit combination, specific features, please refer to the relevant questions and answers.

Driver why packed in the trunk? packaging line, such as a scaffold to fix them?

No, accurately, bass unit must be boxed, treble you can pack is not installed. There are two reasons makes bass unit must be mounted in the box: one is to eliminate the phenomenon of the "acoustic short"; the second is to inhibit the driver's low frequency resonance peak. First, the first reason. Bass unit before and after the diaphragm in motion, in addition to the front of acoustic radiation, the two directions of acoustic phase reverse, that is, a difference of 180 degrees. Because of the low-frequency sound waves of a wavelength is long, its diffraction ability is strong, that is the direction of low-frequency sound waves are very weak, if the driver does not boxing, backward radiation sound waves will be around to the front and the front of the radiation of paradoxical cancellation, generally forward-acoustic radiation energy is significantly reduced, this phenomenon is called "short circuit" the sound. "The phenomenon of sound circuit", must be to eliminate low-frequency radiation cannot be effective. If the driver is mounted on the rear of the case, the diaphragm is a box of radiation barrier, which does not form a "short circuit" the sound.

The second reason, every electric low-frequency unit has a low frequency resonance point in this resonant point output reached a peak, but the distortion is also high, transient response very poor, if this resonance peaks will not be suppressed, seriously affect the sound quality. If the unit packing, box at the air of the stiffness of the diaphragm's campaign inhibiting effect so that it reached the low resonance peak, the purpose of improving performance. In addition, by reason of the selection box containing structure and parameters, you can achieve the aim of broadening the low frequency response, well-designed phase box, passive radiator speakers, transmission line speakers have access to such effect.

Why can not the treble unit? packaging because the treble of short wavelength, diffraction capacity is weak, the absence of a "short circuit" the phenomenon of sound, nor like bass unit that requires restraint and low frequency resonance peak, therefore, the treble unit, speaker's role is just a prop.

Box what material manufacturing in General?

Box wood materials produced for general use, because wood easy processing, surface treatment after the get and furniture-like texture easily coordinated with the room environment. By far the most common material is synthetic medium density Fibre Board (MDF), this material intensity is high, but difficult to deformation, cracking, surface is very smooth, without grinding can directly paste the wood or PVC decoration. Some speakers also uses the Particleboard production box, Particleboard is also difficult to deformation and cracking, surface characteristics, the intensity can also, but after a while damp, so it is easy to damage is usually only used for cheap low quality speakers. There are also natural solid wood Board production box, but the cost of natural wood is relatively high, and mishandled easily and Transfiguration, so application of recent years, generally only used for high-end speaker, mainly for wood texture more advanced (especially precious wood) this benefit. Of course, the case is not necessarily to do with wood, plastic, metal or stone can be used, but these materials produced by the speaker is not widespread.

Wooden speaker voice than Panel speaker?

You cannot say that. In theory, the box as long as enough strong vibration does not happen, what material are no different. Speaker voice mainly by the driver, box structure design, divider these three elements, and with case materials of solid wood or wood, or metal with plastic, doesn't matter.