【 Weak current College 】 rookie must-see multimedia speaker common purchase mistakes from---Power By 【 China power house network 】

On ordinary consumers in multimedia speaker purchase common mistakes in the process, I have many times before, this should be the majority of users, haematopathology again, and added my friend ALi brothers latest writing mistakes in the active speaker, on on the masses of users want to be able to guide the correct purchase multimedia speakers.

Material common misunderstandings

Misconceptions about the materials, the most common is the wooden speaker better than plastic speaker, it is believed that many users are deep experience, since entered the market, the sales person will normally be introduced so that the final result in misinformation about the seemingly "axiom". High-end speakers most used wooden box, so you really can't avoid Cabinet resonance to enhance sound quality, but it does not mean that as long as the use of wooden box is a good speaker, the majority of multimedia speaker using density Board (MDF), this kind of material costs reasonable, good performance, but some Jerry-speaker will use poor quality Particleboard, this material is the sound quality of the speakers can't compliment. In fact the case material density and the effect of resonant ability is the sound quality of the main factors, this also means that the plastic materials as long as they can reach a certain high physical standards, can replace the MDF, wood, but the present technology, achieving up to the high cost comparison. In addition, as the global price of raw materials, many manufacturers of wood more and more thin, it can keep wood relative advantages of the plastic material really say.






Box with piano lacquer craft Cruiser S2000 surface features


In addition a material mistake is the so-called piano paint technology, in fact, genuine use of the piano lacquer technology Multimedia boxes are numbered. According to veteran speaker designer describes, this kind of case the high cost of technology to movers to S2000, for example,the box will have nearly cost $ 500. Another point is: in plastic box on impossible piano paint process. So if the dealer huyou you a low-end 2.1 speakers also uses this technology, you'd better turn left, because he even the most basic integrity are not, do not and he's in Mississippi.

Power common misunderstandings

Many users have a misunderstanding that speaker power increases, the better the sound quality, it cannot be denied that the speaker of the reserve power is sufficient, for enhancing the dynamic control of the sound is very helpful, but the sound quality is a complex, not simple will power and good quality independently. Users to the size of your own room and listen to the sound of different styles to choose the right power, acting, not blind pursuit of power. General 10 square meters room, with 6W-10W speaker is sufficient for general use.






It is hard to imagine this high-power speaker placed in a small room about


In addition, some speakers on the market, very high the callout power, in fact that is does not take into account the distortion of the maximum output power, also known as peak power (PMPO power, also jokingly "JS power"), peak power maintenance time very short, multimedia speakers is not possible in that State. Really should callout is rated power, but a speaker of rated power only peak power of 1/5 or 1/8, conversion, a callout 50W× 2 speakers, practical and effective power of only 10 Watts, which is also a rational consumers need to know.

2.1 speakers sound quality than 2.0

Exploring ├acctive sound, most people think that high-quality loudspeaker 2.0 2.1 speakers, 2.0 speakers fit to enjoy high-quality music and voice box 2.1 uneven, rough, only suitable for "games, movies," in fact, this is a misunderstanding, "feet, inches are short," the 2.0 and 2.1 since physical characteristics, advantage, even if only from the tone of comparison, it is difficult to distinguish.

In General, the General is 2.0 speakers two units of two crossover structure, by adjusting the divider, inverted phase, frequency range in design, sound pressure curve is relatively easy to reach. 2.0 speakers the major drawback is the low-frequency extension are often unsatisfactory, and some can improve low-frequency dive of Cabinet structure, such as phase II, 1/4 wavelength, maze, and other structures, its volume is often larger, even at the expense of the low-frequency transients.

2.1 speakers in low frequency extension in occupies an inherent advantage, especially by resonant principle of ASW or sound quality-lower speaker, a small volume reached good low frequency effects, space limited hem bit has unique advantages. Because bass unit with satellite box unit is not in the same box, use the respective dedicated amplifier, the sound pressure, phase of convergence process seems too much trouble, design difficult.

2.1 speakers designed to rely on this is to offset the low sound frequency satellite box, the deficiencies of the dive signal replay music depends primarily on the satellite box, low sound just express the atmosphere, increasing the sense of deep bass from a system standpoint, satellite box is safflower, low sound is green, from a design perspective, 2.1 just speakers of a structure, and no anomalies. While the market's most 2.1 active speaker design putting the cart before the horse, low frequency performance of exaggeration, too, no turbidity gravis, speak of the quality, the most important satellite box but can be reduced to "voice", even the basic acoustic design is not the sound pressure and angle curve cohesion more impossible, it is not difficult to imagine that this concert is the audio products. For the uninformed of beginners, flooded the market 2.1 speakers are mostly this product, easy formation on 2.1 prejudice. Well-designed 2.1 system performance than 2.0 system poor in low frequency dive there are certain advantages, from professional audio BOSE802 + BOSEAWCSII classic combinations to best multimedia Tanner MC15 + SUB250MC gold matching, excellent 2.1 system can be found everywhere.

> Electronic crossover frequency grade high specific power

Exploring electronic frequency and power frequency merits before, we'll introduce the electronic minutes frequency and power frequency of the concept, in order to unpack analysis issues, limited space, here only apply to an active speaker and power divider.

The so-called electronic crossover, power frequency is just a common name, is not very strict, here follows the aim is to make it easier to understand. E-n, also known as fore-n, active crossover, rely on resistors, capacitors or operational amplifiers achieve low pass, high-pass or band-pass filter function, form and frequency circuit, amplifier, transistor and other active devices of crossover circuit is called active electronic dividers, only by the resistance, capacitance, passive components constitute the crossover circuit known as passive electronic dividers, electronic crossover circuit generally before the power amplifier circuit. Power divider by inductors, capacitors, resistors, located on the amplifier and speaker units, there is no active components, dealing with power signal.

The main advantage of electronic frequency: 1 power amplifier direct drive speakers, no insertion loss, increased damping coefficient and efficiency. This is the power supply to make ends meet, amplifier IC power reserve shortage is particularly important. 2 resistance and components replaced, Q value, frequency point adjustment flexibility. 3 using the amplifier to the speaker's features, you can easily add such as precise frequency compensation, negative resistance (change the speaker Q value and Fo) circuit.

The main advantage of power frequency: 1 power divider Q value meaning and electronic crossover, electronic frequency of Q values in General only determine a valid out-of-band attenuation slope, and the power frequency of Q value throughout the effective work of the band has the same effect, is a two-stage divider, Q values are different, their phase, out-of-band attenuation characteristics are different, you can adjust the power divider Q value to obtain the best bet for loudspeaker unit, such as high Q value divider to suppress small unit if climbing, you can get different colors, such as the Harbeth, Roegrs, KEF LS3/5A, of the same unit in each style.

2T/S small signal parameters influence the speaker sound is an important parameter, you can flexibly adjust the divider, through the replacement of different frequency coil and capacitor, to a certain extent, affected speakers of small signal parameters to achieve the purpose of adjusting the tone, that is, the use of frequency circuit of characteristics to make up for the unit in a band's sound. 3 loudspeaker system, General design is the treble unit sensitivity more bass units high, bass unit through the divider and the amplifier directly connected, treble unit you will also need a network through l-resistance to decay signal, reach and bass units the same sensitivity, and L-attenuation networks on the treble speakers have a protective effect. While the vast majority of e-mail frequency (high pass filter) to burst of intense pulsed signal basic without inhibition, fragile treble unit is basically no protective effect.

Ring-type transformers better than EI-type transformer

Many people and even some HIFI equipment end-users that ring transformer internal resistance is smaller, the high permeability grades than EI (square type) transformer, not necessarily.

Toroidal transformers because there is no uniform air gap, coil winding core, theoretically, magnetic flux leakage is small or nonexistent coil radiation. No air gaps exist, poor resistance to saturation, AC DC components exist that is easy to produce saturated, resulting in strong magnetic field exposure. Domestic commercial power waveform distortion in most of the serious, so many users use a ring-type transformer feel than EI-type transformer, or even worse. The so-called ring transformer without disclosure, or as a result of media misleading, or by manufacturers ' needs for commercial publicity, the ring-type transformer fabricated magnetic reveal very low claim only in the City radio into a strict sine wave is established, the practical application of ring-type transformer in order to avoid strong magnetic saturation distortion, mostly consists of several silicon steel belt winding into, leaving the air gap. In addition, the ring-type transformer will also appear in the lead department will leak of confidential information, so ring transformer leakage flux is a certain direction, the actual machine, revolving ring-type transformer, at an angle on the highest signal-to-noise ratio.

The above analysis is built on the transformers, well-made, based on the actual majority sale transformer products due to cost pressures and competition needs, is not strictly in accordance with industry norms, even shoddy work, analysis looks more unpredictable factors. Regular ring transformer core consists of a fixed-width silicon steel belt tight winding. Or for cost reasons, the majority of low-cost ring transformer using several or even dozens of several silicon steel belt splicing, even using edge jagged scrap take-up, wound up with machine car, because the ring-type transformer coil Pack around the core, not destructive anatomy is difficult to find. Machining of Silicon crystal lattice arrangement, neighboring silicon steel strip insulation has severely damaged, this ring type MFL transformer regardless of performance or features will be significantly reduced, even after annealing treatment cannot compensate for the serious defects in the quality.

EI-type transformer in fact performance than ring-type transformer, issue the diamagnetic saturation is significantly stronger than ring-type transformer, and internal resistance problems you can use the appropriate diameter of the wire, to change the way bypass system, using high-quality cores to overcome. In HI-FI even HI-END amplifier, EI-type transformer application is very common, but also from the side describes the problem, therefore, cannot guarantee that the transformer technology and quality, the application of the EI-type transformer is a more secure solution.

High frequency of the sound is good speakers

Common to enthusiasts buying divider is most concerned about is how spectrum, few order filter, prices of many. Well some of that is picked up and own units of the same brand, inductance of diameter note, capacitance of material, how much is the crossover point. As regards the divider design is reasonable, whether the unit is very few people will care about.

In enthusiasts also exist such a view: divider filter orders from higher up on the ground that can be steep attenuation characteristics,Interference between the unit is small. So the third order, the fourth order of filters have been designed and written by large admire good performance, a sense of hearing, or even a few League or even have the "honor roll" of Germany digital loudspeaker nominal 256-order crossover. Here is not to belittle lot order filter, but in fact reactance devices communicate signal through a phase shift, every order of the amount of ultimate phase shift is 90 degrees. This represents a 4-step filter on the work of the band should have 360 degree phase shift, high bass unit phase must interface is very good, otherwise a dislocation is a problem that produces peak and Valley. The case is very easy, contrary to good cohesion has become a very difficult thing.

Because phase cannot be good cohesion, produce a series of peak and Valley also is a good thing. To make matters worse, because the phase of dramatic changes brought much of phase distortion, the orientationof the sound and sound field reproduction brought bad influence. According to General experience, the ideal scenario is using second order filter. The reasons are: (1) as the standard second order filter attenuation slope 12dB, under normal circumstances is sufficient; (2) as the maximum phase shift is 180 degrees, so it is easier to achieve phase phase distortion butt, at the same time is also relatively small. A design, making-of-the-art divider, should be directed at a group of cells tailor-made, there is no one universally truth of divider. Reason is simple: each speaker as the design, production, has different behavior. Properties, from the sound pressure to phase characteristic impedance characteristics are different. Design a divider should consider these factors, make the unit fully develop the advantages, disadvantages to inhibit, before considered as a successful design, blind pursuit of high frequency, we should say its understanding of the speaker is quite elementary.

Written in the last:

Multimedia speaker system is primarily a mix in the PC platform, is used to close the sound field to listen to the sound playback device, generally speaking, so long as you buy Felicity, from its own reality, don't expect too much, can give life a lot of fun. Finally, we advise you not to blindly believe in a brand, listen more, cultivating the right listening, find the most suitable for your speakers is the kingly.