【 Weak current College 】 speaker purchase basics answers---Power By 【 China power house network 】

Speaker selection basics questions
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 has telegraphed indispensable part. Of course, the speakers also may have versamat, down-tube, the collapse of the "labyrinth channel", strengthen the disk/partition, other parts are strengthened, 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, such cases take specific 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. 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? due to 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 some psychological flat so that the power amplifier driven. Driver what kind? horn cells 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 held in a variety of more 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 meet, 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 top trebleOf diaphragm can be used metal 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 of production such as 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 fixed 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 General what material manufacturing wooden box General? material manufacture, 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 ambitions were plate production box, Planer heart plate is also difficult to deformation-shaped crack, 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 sound than the Panel speakers? can't say so. 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. Speaker is how to categorize the classification of? speakers have different perspectives and criteria, press speaker of acoustic structure, a sealed box, phase box (also called low-frequency reflex enclosure), passive radiator speakers, transmission line speaker, their respective features, please refer to the related question box. Inverted phase box is now mainstream; from the speaker size and placement, floor boxes and bookcase box, former volume is relatively large, General direct amplification on the ground, sometimes in install shock with sound of feet. Floor box because the box volume large and easy to use more and more low-frequency bass unit, it is usually better, but the output sound pressure level is high, the power load-bearing capacity is strong, and therefore suitable for listening larger or more comprehensive. Bookcase box smaller, usually on a tripod, features a flexible display, does not occupy the space, but from the box volume and bass unit size and number limitations, its low-frequency is usually not and floor boxes, hosting power and output sound pressure level less suitable for smaller listening environment; press the replay of the band and narrow band speakers, most of the speakers on their design goal is to cover the full width of the band, band speakers. Narrow-band sound of the most common is with home theater and the interest of subwoofer (subwoofer), Ulf only used to restore to a low frequency band is very narrow; press any built-in power amplifier, speakers can be divided into passive and active speaker, the former does not have a built-in power amplifier, speakers can be divided into passive and active speaker, the former does not have a built-in amplifier and the latter has, currently, most home speakers are passive, but your subwoofer is usually active type. The characteristics of a closed box? closed sound driver installed in a closed box body, so that the diaphragm backward wave radiation of the comic is box completely blocking, not to go outside the box and diaphragm in front of offset by positive comic wave solves the problem of the "short circuit", the sound of the bass to radiation. Sealed box for low-frequency attenuation characteristics compared to other types of speakers are gentle, tantamount to a second-order low-pass filter attenuation curveLine, which means that it has all types of speakers the best of the transient response. At the same time, sealed in the box at the air to form a strong "air spring", can inhibit the diaphragm in the resonant frequency of displacement, reduction of non-linear distortion. However, the air of stiffness also makes the driver of the increase in low-frequency resonant frequency, the lower the overall sound than the units of low-frequency in free-space conditions has increased, and the inverse case, transmission line loudspeaker design compared to the closed lower bound of low frequency relatively less. Also, the diaphragm back of radiation are not utilized, with the result that its efficiency is lower. Air-cushioned speaker and closed speaker is one thing?
The earliest cushion speaker of the United States and his partner H.01son J.preston after patenting, 1950 is AR company promotion, representative products was the famous Quartet AR-3 (RTHK enthusiasts called "San brother"). Air cushion speaker system is a closed case, it is characterized by the use of high-resistance of driver and body design small enough so that the box at the air of stiffness is significantly higher than unit vibration system stiffness (usually over 3 times more), on the unit's vibration system, inside the air on its role as a flexible and strong air cushion, this speaker so. Air cushion speaker distortion is low, the transient performance is quite good, once popular, however, such speakers as a high-sensitivity of the cell, with generally lower. Inverted phase box? inverse box is by far the most popular speaker application, it confined box adds a contained catheter (down-tube), tube end with the air connectivity inside and the other end by box wall openings (reversal of) access to the box. When the driver of the diaphragm movement, on the one hand, the external radiation sound waves directly, on the one hand, and compressed (or expand) the air inside the box. The box of the control phase of gas from the mouth, thus discharged down phase mouth becomes driven air of "second diaphragm", if the design is clever, down-tube-box system can just make the diaphragm to the radiation of acoustic phase 180 degrees (inverted phase box so its name), from the opening sound radiation went out on the front with the diaphragm acoustic phase of radiation, while the same phase of radiation so that the sound can be superimposed, thus strengthening and extending the speaker generally of low-frequency response. Inverted phase box and closed the back using the diaphragm to the radiation energy, resulting in higher efficiency. However, down phase box also is not perfect, in addition to design debug difficult than closed boxes, open fast flow air easily aerodynamic noise. In addition, the reversal role is essentially to achieve acoustic resonance and radiation by opening the transient response of the sound waves are relatively poor. DEBUG comments: phase again! box down cross wave summary only "speaker diaphragm acoustic reflection on the back of it," but is half closed cabinet air is forced compression produces resonance of sound waves, sound waves from the air inside the tubes instead of diaphragm! if only to set the diaphragm acoustic reflex out after radiation, to down-pipe? direct openings not just passive radiator? and what features speakers? passive radiator speakers also called empty Cone Speaker, is in fact a reversal of a Variant, it works and is very similar to inverted phase box, only passive radiator replaces the down-tube. Passive radiator's structure is similar with the driver, there are discount ring and radiation acoustic diaphragm, but no voice coil and magnetic system, diaphragm movement full box can receive better low-frequency response, efficiency is higher, but it is also different from the characteristics of the inverted phase box. Superior phase box handling overcomes the phase noise of easy production air boxes, but passive radiator speakers with more than phase box steep low frequency attenuation characteristics, means that the transient response ratio down phase box. United States PolkAudio company is production of passive radiator speakers most representative of the manufacturer. DEBUG comments: now in multimedia speaker on the subwoofer, the empty cone is not uncommon. However some products in satellite box or use empty cone is purely to behave himself. Transmission line speaker what was so special about? transmission line speaker and airtight box or inverted phase box design is completely different, it uses a 1/4 wave length of transmission lines to achieve absorption unit displacement of resonance, inhibition of diaphragm, low frequency limits these purposes. Transmission line speakers have the following basic characteristics: bass unit followed by a talk with long catheter (transmission), duct length for unit low frequency resonance frequency (or slightly higher frequencies) of 1/4 wavelength, shirt, jacket often folded in box of internal, looks like a maze; connection driver on the end of the transmission line cross-sectional area at least units of radiation area to 25%, and then gradually getting smaller, to transmission line exit exactly equal to the cell membrane of radiation area; transmission lines for wool or glass wool in laying and damping qualities. Transmission-line speaker and sealed box and phase box design has more than a deep bass, but to the famous speaker expert MartinColloms United Kingdom, represented by some people think that the transmission line speakers more difficult to avoid the transmission of resonant bass. Some multimedia products now also known as the use of a labyrinth structure only after special design deform phase box only, genuine transmission line design, also not met multimedia speakers. For listening to sound really need "strategy on contempt for the enemy, tactically" this wisdom. First you confident your ears are not better than the so-called "golden ears". Human auditory Physiology tell us that with age, the eardrum and inner ear hair will become hard and distinguishing, couldn't respond to a very high frequency. Only the young children in hearing of small size, soft texture, you can hear ultrasound 20khz above. And 20 years later on gradually waned, 50 years old man has been difficult to hear 16khz voice. Of course the old fever frenzy in know-how and experience rich can compensate for that, but the hardware becomes bad necessarily. Therefore, professional audition subjective evaluation needs of different age and sex of people to participate. As long as there is no hearing defects, you can when judges. Of course some of the most basic of audiometry and common terminology used in subjective listening evaluation must understand and grasp the exact meaning and sense. First you can familiarize yourself with the pure sine letter-frequency ACNumber of sound, which is check the audio equipment static performance is good or bad. The most convenient method is to play Hugo fever disc (a) on the last 17-45, here is the sine signal from 25hz began to 1/3 octaves as a step to 20khz, a total of 29. If there is a high-quality analog sinusoidal signal generator is better, signal source does not have the high-order harmonics are not required to use the CD. Starting from paragraph 17, the backward on the pitch increases. If level is unchanged, began to gradually increase loudness; to 27, 28 (about 400 Hz) of the volume is no longer an increase to 40, 41 (about qibaqian Hz), volume began to decline. If the device is not good, relatively flat in the middle of the volume of the paragraph would be narrowed, listening to music at high range and bass domain components are inadequate. If the entire frequency tones are not rising, there is a mutation of a paragraph, such as 19 sounds than 20 harder, louder, this illustrates 19 (40hz) voice has the original intermodulation 40hz bass, high frequency audio series, so high up the pitch, loudness is also big. A lot of poor quality speaker will then appear. Normal listening to music, a frequency was transient and most of the time while you have a lot of harmonic constituents, rely on sound feeling wrong to tell if a device faults, the operation is more difficult for beginners. Pure listening easier operation. Room acoustic environment is defective, if there is a standing wave, resonance or at the audience seats of the reflecting surface, can also make different frequencies loudness uneven, you can transform your speaker set-up or room furniture store, looking for reflector or resonance source. Single-tone and stability, simple, easy to find a bunch of clutter in the noise. In addition, several key frequency tone 25hz (17), 40hz (18), 500hz (29), 1khz (32), 2khz (35) and such should have a pretty good idea 4khz. Many speakers including low speakers actually no 25, 40hz bass, many people put a ring of around 60 — 80hz bass as a subwoofer in feel. Similarly, 2khz, 4khz voice sounds too harsh, but it is not for people to pursue 12khz above the treble. Understand the actual listening to interested description vocabulary sound complex, the sound of auditory sense to describe the total vocabulary to express, but the number of adjectives in the vocabulary of the most subtle. If the description from the foreign language translation is more difficult, I have an English language description of the sound quality evaluation, bringing together 52 adjectives, some words with English-Chinese dictionary on the Chinese comments on weirdness, how to understand the expression of sound characteristics? so as detailed as possible delicate description may be more difficult for the exact or the simpler. Canada National Center Test speaker sound quality, allowing judges to fill in table 10 description, easier to understand and master now explain their expression meaning of sound characteristics, to improve the subjective sound hearing person can help. These words are: analysis: analysis of the definition, description, also known as voice clarity. Listen to the language of enunciation cleanly, with no ambiguities. Listen to his music, some of the music and what music easy to distinguish. Hear the bass, the drums was crisp, the trombone, bass drum performance right timbre, unlike TV or phonograph in the loud hum.
Soft: sounds sounds soft, warm, make you feel comfortable, not harsh delighting without husky voice. General girl program to listen to this characteristic is better, with disco and heavy rock music to listen to the equipment of this area would not be appropriate. Although mild here refers to equipment performance and not the software itself, but the software program itself is hard to listen to this performance. From the audio signal characteristics, soft representation, bass restored correctly, noise and harmonic distortion. Equipment of harmonic distortion increases the bad sense of composition, listening to the treble harshness, shrill, metallic taste heavy (like the sound of metal materials). Fullness: voice, baritone and enriched by mellow bass that feeling more obvious. Demonstrate equipment band wide, particularly the bass end extended well, bass frequency response uniform, reverberation. Bright: sound crisp and translucent, fresh feeling, soprano and voice and strings of treble trumpet more readily found in instrumental music the feeling. Description of the equipment of high audio flat, homogeneous and low distortion. If treble back or with distortion, bright becomes shrill. In addition, you should have a moderate amount of reverb, otherwise there will be a dry sensation, lit up. Open wide: instead of description is narrow, extrusion, narrow sound field, lack of spot to listen to the kind generosity of time. Stereo programs that respect the feelings and two-channel crosstalk between level and balance. Crosstalk, symmetry, reverberation, sound field feels spacious. Cordial: cordial or on-site sense refers to sound as close to the side, reached out to touch. General audio segment performance good equipment, this feeling strong. Noise and distortion: no signal input, speaker of hiss, AC hum is claimed to be a noise, or workmanship of the device. Distortion is due to equipment wire adverse or poor frequency response, so that the original sound has changed. No input is open enough volume, the speaker a metres should be can't hear some noise, otherwise the program will need silence, there will be annoying background noise when using the usual sense of the sound becomes poor. Distortion that sound aliasing, and are familiar with the original sound comparison can catch up. Intensity: the significance of different intensity and loudness. Loudness means sound feeling. Two sets of equipment can be put on the same track, loudness meter to the same response. But one might sound rather dull, another loud and powerful. Efforts for sound and energetic, ambitious, meaning that the sound in the low-frequency components of a strong, dynamic range. Optical ring no, to go off without distortion is the intensity. The last two for satisfaction and fidelity, this is a general impression and contain personal tastes and desires. Consciously use the above descriptive to compare different equipment sound, can begin to practice sensitive ears. When your hearing ability of identification, it is necessary to note that after the exclusion of psychological factors on auditory effects. A hard day's mother was sleeping in the car or train Benz's tweetsGreat sounds are indifferent, but their baby's crying or restlessness is very sensitive. This is one is often used to describe human hearing system and selective examples. When you hear a sound equipment, equipment for appearance, price and Media Madness propaganda indiscriminate bombing, has given you caused a preconceived impression. Price expensive imported brands, will play in your psychological depths on a base score. Therefore, when you actually listen to watch remove the base score. But the psychological phenomenon is a science, no matter who is never completely RID. So listen to adopt professional subjective: a double-blind trial hearing will never see devices, speaker and equipment are slotted opaque fabric cover, only heard not to its surface; second, the operator did not hear the sound, the instructions exactly as instruments out of the sound. Research on human physiology of hearing, as long as the volume indicated slightly bigger, the same frequency range voice gives people a sense of the broadening of the pitch. Therefore, if two speakers of the different sensitivity, the system does not always make the correction, the loudness sensitivity lower the sound box score will suffer. Businesses want to induce you to buy a product, an audition time as long as the volume is higher than other zoom, you'll be hooked. Therefore, the operator should not hear the sound, so as not to put their point of view virtually brought criticism.
The previous system of subjective listening takes first place a-b-a reference materials, and test equipment, and reference materials, final scoring. Later found this program still has induced, because you know that the second paragraph as the measured sound, always want to hear from some of the differences. Now more advanced power control subjective listening Labs have adopted the kind of audition at random. First you reference sound, and just how many times you want to hear, listen to the sound can also be compared to many times, this is the training phase. DHT scoring stage, first for you reference sound, then give you sent another sound, the sound is the reference sound or the sound is generated by a computer to listen to a random show, then you points. If you want to listen to a sound that can be referenced, but want to repeat the second gives voice will not be possible. So after several rounds of scoring, the computer can make conclusions. If the second random gives reference to sound when you mess with a points, the computer will think you have a problem hearing, your score will not be accepted. Only reference points can make accurate, audition rating is valid. This essentially eliminates the interference of psychological factors and cleaning hunshi "Nan Guo," it is very difficult, but also will be subject to a conflict of interest, the implementation of the opposition have some difficulty. An authority to proceed on a number of recording engineers and enthusiasts to audition, one-eighth of the human being as a result, they are the "golden ears" of the "golden ears". In addition, at the start of the training phase of the evaluation is not the same, and enter the results of the subjective sense of hearing is objective and existent. In other words, any listening is no problem, with a little training can also be subjective audition judge when. Scientific conclusions are unique, and repeatable. Believe your own ears! from physiological perspective of real "golden ears" is no-one in a million, establishing a correct concept of listening, cultivate the good habit of listening, more reasonable listen links, is the key to improving evaluation standards. However, receipt of the "ears" only applies to their own choice, and make a recommendation, or use the "ear" for the standard. Listen to music with the heart to hear sound in the ears at this point you can understand the physical sound complex but not mysterious, when composing music is sound. People listen to music and listen to the sound is different, the former with the heart, the latter with ears. When listening to music, ears is just one channel, Beethoven's ears deaf, author and conductor of the famous classic, visible ears here's role is not fatal. Listen to the equipment or bad should rely on the ear, ear to identify space sound good or bad, the soul will mislead your judgement. Enthusiasts tend to both ears and mind listening to a sound, it becomes most people cannot read or accept their view. I think when you go to pay attention to when choosing equipment for ears and go home to play equipment may wish to also use the points mentally, ultimately used to enjoy music, of course, try to Cézanne with musicians, equipment and even sound however is the way to the other side of a bridge. In the design, installation of a sound system, you will encounter power amplifier and speakers of IP issues. In timbre, ultimately enabling overall equipment restore tone is neutral, it is only considered from art. From technical considerations, the power amplifier and speaker matching elements are: power matching to achieve high-fidelity listening, rating should be based on the best listening to sound pressure to determine. We have such an experience: the volume, sound weak, thin, dynamic out, Matt, low frequency difference significant missing, chubbiness, sounds like condensation inside out; volume is appropriate, sound natural, clear and mellow, soft, supple, strong and dynamic out; excessively high volume, gentle sounds hard, rough, not have pierced ears feel, therefore to burst pressure level and sound quality-greateropportunities relations, provides for listening to the tempo of the sound pressure level best 80-85dB (A weighted), you can listen to the tempo to the speaker's distance and speaker features a sensitivity to calculate speaker's rated power and power amplifier power rating. Power reserve match to make box can vary according to the program in bursts of intense impact without damage or distortion, here is an experience worth noting: the selected speaker nominal power rating is calculated by the theoretical power of three times.
Tube power amplifier and Crystal power amplifier, the required power reserve is different. Here because the vacuum tube amplifier overload a gentle curve. On top of the musical signal, electron tube amplifier does not have clear skin, just to the top of the sophisticated variable round; this is often said of flexible shear peak. The transistor amplifier in overload, nonlinear distortion rapidly increase, signal have severe clipping, it does not make the top variable round it neatly squared. Thus for transistor amplifier reserve selection are: 10 x gaobaozhengong drop; application of high power amplifier for 6-7 times; application of mid-range power amplifier for 3-4 times; electron tube amplifier you can considerably less than the above ratio. For the system's average sound pressure level and maximum sound pressure level shall be kept of the number of allowances shall be considered broadcasting content and work environment。 The redundancy of minimum 10dB, modern pop music, playing music, such as di needs to have a 20-25dB redundancy.
Impedance matching it refers to the amplifier's rated output impedance, and speaker impedance rating. At this point, the power amplifier is in the best design load line status, so you can give a maximum distortion power, if the speaker impedance rating is greater than the amplifier's rated output impedance of the amplifier's actual output power less than the rated output power. If the sound is less than the rated impedance of the amplifier's rated output impedance of the audio system can work, but the power amplifier is in danger, call the overload power amplifier has a comprehensive over-current protection measures to address, on the tube amplifier, impedance matching requirements more stringent. Damping coefficient of match (this is the most difficult to understand) damping coefficient KD is defined as: KD = amplifier rated output impedance (equal to speakers rated impedance)/internal resistance power amplifier output. Because of the power amplifier and the output resistance does become speaker of damping devices, we have decided the KD value sound damping of the electrical. KD the higher the value, the heavier electric damper. Amplifier of KD value is not a better value than General Assembly, KD to speakers, ranging from electric damper overweight so pulse frontier establishment time growth, reduce the transient response indicators. So when you select the power amplifier should not be one-sided pursuit of KD value. As household gaobaozhengong, damping system sensitive one experience values of reference; transistor amplifier KD value is greater than or equal to 40, electron tube amplifier KD value greater than or equal to 6. Ensure playback of steady-state characteristics and transient characteristics of good basic conditions, should pay attention to the speaker of the effectiveness of quality factors such as (Qm) and amplifier damping coefficient (KD), and this combined with the speaker of the feeder as part of the audio system as a whole. Speaker-feeder power loss small 0.5dB (about 12%) to achieve this. In General, the thicker the better line, preferably double tap tone, but requires speaker is double tap tone of the divider, upscale has four wiring block, the arrow of two negative is an independent, not connected to connected together was fake. In the old shaoyou, there is an unwritten, and is the amplifier's price should at least be speaker 1.5-2 times, and the more upscale product, the higher the ratio. In other words, in matching rather than "big horse cart", not "small horse-drawn cart." This is because often the more upscale speaker, one can only play the 70% level of high-end products, often reverse play 100% better than a low-end products. However on the multimedia product, it was over, the more high-end products, the power amplifier covers the entire product cost ratio, the less often. Some products to almost 4000 Yuan grades of the presumption of its raw power amplifier box before you can play a unit of horizontal one, but with just a maximum value of $ 100 amplifier. Some multimedia enthusiasts also tend to be optimistic about these products, in fact, if you do not consider an addendum (of course, for an addendum, this product is the best, because the friction circuit is feasible, friction units, for most people is simply not feasible), this product regardless of the actual play effect, or as a commodity by design (especially on this point), are not satisfactory or reasonable. After all, or the thrust of the article — reasonable match, power amplifier, with differential unit, of course, is not good, but in turn, will spend all cost, with a unit just just cannot use the amplifier is not feasible. Unit is the most important multimedia speakers, but is by no means a unit's well that ends well. Common speaker set-up in reproducing all the speaker setup how much weight? if you would like to ask me, my answer is: to make sound good sound, space conditions, equipment of collocation, speaker set-up, and users to fine-tune the four items, such as the other. Where the speaker set-up is not necessary to spend money but also allows audio sound better, so I'd say speaker set-up is not accounted for 2% of importance, which is 50%. If you do not trust, please carefully to various speaker set-up mode tried, I think that your idea will be changed. To tell you how to implement the "pendulum displacement" before, I would also like to ask readers to reveal an important concept, that is "sound and listen to space is one of the" voice of manifestations is in speaker and the listening space of interaction between the two. Or, I should say, space, speaker set-up and listen to the location of choice is the interactive, especially on your Ning room condition is how bad, if you can find the interactive best balance allows audio issue good sound. First method: Trinity seven proportion method method: the length of the room are divided into three equal division (3), one-third of the length in the speaker Office (a), the interval between the two speakers to room two-thirds of the length of 0.7 times (7). Speaker of the best has to have a slightly inward projection angle, but not in projection may also be affixed to the listening position rearward wall. Effect: this method is used to a larger size, the proportion is even (for example 1: 1.25: 1.6 or about l:1.6: 2.5) of space, can be balanced sound and the sound field and depth. This is the recommended audio Forum regular readers to try the pendulum. The second method: three share method: the length of the room are divided into three equal division (3), the width is also divided into three equal division (3), speaker at length and width of the intersection of the first partition (a). Speakers can have slight inward projection angle, even without inward projection may also be affixed to listen to the position rearward wall. Effect: this method applies to a larger size, the proportion of space evenly. It and the "three a seven-percentage" of the spirit is consistent only with the "three a seven different proportion method" is the interval between the two speakers is relatively narrow. This method can be balanced sound and the sound field and depth. TAS magazine editor-in-Chief-Hi United States using this method. The third method: screw pendulum method one third the room sound to one half the length between the two speakers, and then try to rely on two climbing over the wall (such as the room is very wide and you do not need to close to the side walls) and two speakers of inward projection angle is greater than 45 °. Listening position to the intersection of the projection of intersection — 1 m after 0.5. Effect: this method of authoritarian treble too sharp, baritone, bass, not too thin. Also,In the face of many adverse environment can achieve the best results. This is the "audio Forum" for common adverse space provides effective pendulum. The fourth method: equilateral triangle method method: the first condition is the speaker you want to leave the back wall (at least 1 metre above) and the side wall (at least 0.5 meters above the sea level). The second condition is that the two speakers and listening position, drawn as an equilateral triangle. The third condition is the two speakers of inward projection angle is 45 ° or more. The fourth condition is the equilateral triangle can be. The room is small, after the level does not large squares down; the room is big, big time after power-on the equilateral triangle. Effect: this is commonly known as of the close method of sound field hearing. Its advantage is that you can reduce the reflection code on shone wall sound direct tone of excessive interference, so get a good sense of orientation as well as the sound field and depth. This is to be able to hear the most, the most direct and most clearly the details of the pendulum. Many commentators in assessing sound like this method.
The remaining four are omitted.
Sound is sound and AV equipment in the most difficult to buy, because the brand more often make people uncomfortable. However, the speaker and can play music through it, choose a good speaker to roses. The pitch of the natural balance of the human voice sound to evolve and that music should be as close as possible to the original sound and not too out of shape, the sound should be smooth and silent dye, did not recognize too strong and too weak tone (peak and Valley), in-band and treble should not be too loud or hold back for a while. You can find some frequency range wide instrumental music (piano), recording to put on, listen for low, medium, high-scale changes in timbre. Sound characteristics 1, frequency balance can then hear the voices of different frequency bands. Hear the bass should be compact and clear, the exact tone, no hum, not slip or ambiguity; and as a music major part in the audio section of the human voice is even more important, and that the music should be natural, not too loud, or stuffy nor too light or too light, treble you should open, air and extensibility, no screaming or fading phenomenon. 2. analytical force listened carefully to hear music in the details, such as cymbals sound or piano sound fading, concert halls or Jazz Club in the ambience. If the low level of detail not too clear, it shows a lack of transparency of enclosure. This is a good speaker and bad sound differences. 3. transient response speaker should be able to reproduce music in transient. Percussion chord sound drum or dial guitar sound intensity when it should have and listen to the exact, nor to "surprise" and "emotion" or "slow" and "slow". In addition, the natural decay of sound, such as cymbals sound and voice "tail", you should gradually decay rather GA however only. 4, dynamic range should be compared to the low level and high level dynamic sound playback. Ideally, the speaker should be from the lowest voice to the most powerful orchestral music can be played back continuously, will not let the silence part couldn't hear or loud when some of the paragraphs. 5. sound positioning and sound field (stereo) listen for the sound and image positioning. Note whether instrumental or vocal sound field from the space, if speaker is in the Interior there are set-up correctly. You can find some mono audio products to audition, you can focus on understanding the performance of other speakers. Sound like the location good speaker will disappear in the sound field in the "," let the listener at all to the good performances of music from a pair of front speakers in the fat out of music upheavals, singer seems to stand in front of middle-of-the-road position somewhere out there, is YODEL. 6, scattering the indoor different locations seem to hear. You can sit and stand to listen to, to check the vertical plane of acoustic scattering. At this point, heard the treble will have great changes. Some speakers of the "Emperor" only in a narrow range, and some speakers in the wider context for good sound like positioning. Acoustic colouring some speakers have "noise dye" or sound playback bug, but also on replay music.
If due to poor design of the box appear harsh sound, the sound of metal treble, rough or smooth baritone. If both play which sound recordings are able to hear the sound, so we can be sure that the speakers have been afraid of inherent sound dye added to the top of the music playback. Typically, when you miss a replay some sound better than ever, music to add more original no sound with more able to tolerate. Some speakers who wish to add sound with, such as adding some more bass component and let the treble brighter, although night listening to the speaker seems to be good, but long after the hearing, it will be bored or even let people fatigue, this speaker is not worth to buy. Sound playback environment in the set-up of audio to hear sound in shops, it is not likely to be listening to the speaker's full performance, since the speakers in the room set-up is very important, even if the speaker to the front or rear, slightly reposition the few cm, will make the speaker of the low-frequency response of the major changes occurred. The speaker put in can strengthen or weaken the bass room, tonal balance will change, or be heard rich bass or hear what bass. Also, the speaker setup not at that time, less than originally expected of sound and image orientation of the sound. No No, unfortunately, some audio store because of the storefront, had to be reproducing a row of a row to display in the wall, thereby not giving full play to the speaker's performance. What's more, even if the speaker in the shop set-up correctly, but still with their own home listening environments with relatively large differences. Therefore, it should be at home for the speaker found the right place, so that the speaker is fully fulfill its power but one. On the left, right, doesn't fit you return or change a pair and try again, you'd better however. Listen to the music as the familiar CD album recording sound far, there have been times, so listen to audio store and buy the speakers, it is best to bring some of their more usual to ripe audio CD disc to good. This way you can listen to the playback time out which is the original CD recording is on, which is unique to the speakers. Because of the different types of sound recordings to try to listen to music and voice comparator with real differences of the sound. Note the coordinationMatching speakers also with listening room, audio equipment, as well as listen like a coordination and matching relationship. If the room is small, with large floor-standing speaker would not too such as appropriate. Because it will make the room too loud and bass also tend to drop out. Conversely, if the room is very large, use a pair of small speakers will feel solid, sound production. Should push music sound of power amplifier "power 100". The speaker expressed with dB sensitivity is one of the indicators in this area, the higher the sensitivity, be given input power, sound-reproducing will be louder. However, the sensitivity is also only represents a connection, the power amplifier output, the size of the room as well as the usual love with much volume to listen to music are all important factors. In General, usually in the music, the amplifier output can have on average of 10W also is enough, but for the majority of home theater, stereo power amplifier each (not counting incoming bass channel) have 40-100W power also. As regards the speaker with audio equipment match, it still has a "make" requirements. If the selected comparison of high-end audio equipment, such as in the case of several tens of million or on Hi-Fi audio equipment, then spend several thousand or even 1-2 million Yuan to buy speakers should be and necessary. If the original audio equipment only general equipment, with high quality speakers can only blind light – in vain. Heavy weight first should say a few words about quality, we all know that bass. Therefore it should be heavy weight, would rather less is better. Too many zone distortion bass on unqualified people seem very fun to say, but expert infidel, because for a long time to be bored yet easy-to-produce fatigue. Therefore, this speaker is unable to buy.
Repeat specific speakers. Keep in mind that the speaker is not expensive, the better and more is not necessarily the bigger the better, often some careful design and manufacture of small speakers, built-in high-quality speaker units and devices, performance has been better than some of the contents of multiple cells only low monster-like sound better. Small speaker for approximate to "point sources", sound and image positioning also more accurate, more suited to small or not listening for indoor use. Besides the speaker units, in addition to the most common electric speaker, there are some other type of speakers, their different characteristics, such as High-End level flat magnetic speaker, electrostatic speakers, belt speakers and speaker hybrid design. Not urgent but would rather spend more time usually say, a stuttering is not into fat, pick speakers should not worry, there is almost no may in 3-5 minutes to determine the quality of a pair of speakers. You want to spend a lot of time, using a wide range of music to as many listening to a wide range of speakers. You can see, and hear and punctuation, and this for selected speaker is a world of good. With his wife, or invite friends to listen to, out of the idea is fine, but not without its own opinion only listen to others. In the same volume of comparative psycho-acoustic show that people listen to the speaker for the test, tend to think that some of the speakers sound rolling is a good speaker. Therefore, the test is provided in the same sound level by comparison. Listen in stereo shop should also be possible in the sound level of the same circumstances, necessary even to go buy a sound pressure level meter to test. This table is a useful tool for future debugging home theater speaker system with suite will also come in handy. You only have a crush on go buy it to get a foot on bass, acoustic image location good, sound playback effect is not bad speaker although difficult, it is also possible. Believe that the above provisions, would find such speakers. The problem is that it really is to buy speakers? a long time to enjoy the music? do you want to cool, keep in mind that only really able to impress you, makes you excited, let you hear a heartbeat, let you fascinating speakers that let you to forget about listening to music can sound out and only the beautiful music upheavals cents of the gas floating speaker, is that you should buy the speakers. Good summary of the speakers is not merely sound playback effect is good, the more important features is the music and film music all the energy and enthusiasm, all delivered to you, let your heart beat, you can fully experience and feel the joy of listening to music, you should go and buy this as a speaker!