College】 【weak speakers and speakers of foreign technology developments.

<br> <BR> present, foreign speakers and speaker in the production of more than 280 professional manufacturers (according AUDIO data), there are thousands of products. .Speaker and speaker audio playback system as the terminal, its quality is good or bad, will directly affect the entire sound system to play sound effects. .Engaged in the production of the major speakers of foreign companies invested heavily in the power of the speaker constantly develop new products to meet different environment and different audio equipment and higher requirements. .In recent years, with digital audio technology, the requirements of the speaker and more demanding. .In order to meet the requirements of technology development to meet the needs of consumers, the world famous speaker companies are committed to improving the performance of the existing speakers, and research and development of speaker-specific new materials, new technology and apply new design methods. .I now know that large companies the world and its system of technical status of the speaker, characteristics and unique new technologies are described below: <BR> <BR> 1. The foreign status of the speaker and speaker technology <BR> <BR> 1.1 Professional speaker <BR .> <BR> mainly refers to the film, stage, halls, sports venues and other occasions, the speaker and speaker box. .In recent years, with new materials, new technologies, new structures, new technology development, stereo, digital technology, CD and VCD of popular, professional speaker and the system also achieved great development, new products are emerging .. .U.S. JBL, EV, BOSE Corporation; British KEF, TONNY companies; Panasonic, Pioneer, Mitsubishi, TOA, YAHAMA companies have launched in recent years, a wide variety of professional speakers and speaker systems. .Their distinctive feature is under power, were more than 200W; efficiency, generally in the 98-100dB; directional wide. .<BR> <BR> Order to achieve these characteristics, the world's leading manufacturers of Eight Immortals speakers recount. .The main approach taken are as follows. .First, the use of new magnetic materials, the use of new magnetic circuit design. .Companies such as JBL's SFG used magnetic circuit design, which includes the flux balance, reducing the driving source inductance and thermal conductivity of the new structure set up. .Its energy product magnetic material used up to 3.6MGsOe above. .This makes the speaker power handling capacity increases, strong bass reproduction, with intensity. .Second, the use of new materials, such as the use of aerospace titanium diaphragm tweeter, because E · P titanium is superior than the companion material for manufacturing high-quality treble diaphragm. .Titanium diaphragm tweeter with high frequency by the larger extension of power capacity has increased greatly. .Woofer cone with laminated high-density complex. .Voice coil with flat wire, flat wire because the high duty factor, high utilization rate of the magnetic circuit gap, can obtain higher sensitivity. .The technology invented by the JBL, and other major companies followed suit. .Third, using the new horn, used in professional sound reinforcement and long-term exponential horn speaker has been a new point of the horn, etc. replaced. .Directivity horn and other key technology is the horn wall in different shapes, as in the past simple linear, exponential into a complex, non-continuous functional in order to achieve a constant directivity. .Fourth, the extensive use of computer CAD, CAM and CAT technology, the use of modern technology, mining the potential of traditional speakers, professional speakers to make products better. .Representative of the products, such as JBL's professional speaker speaker series MR, SR professional speaker speaker series. .<BR> <BR> 1.2AV speaker enclosure <BR> <BR> mainly refers to the music center for home hi-fi system, karaoke OK karaoke bars, dance halls and home theater sound system speaker speakers. .AV speakers have made great progress in recent years, new products are emerging. .The world's major speaker companies have launched various forms of AV speaker enclosure. .They not only have the advanced technical performance, but also from a practical shape, increased sensitivity, extended dynamic range playback band broadening and good transient response and other technical characteristics. .There are two common frequency speaker enclosure: with an 8 or 6.5 inches of rain in the British woofer with tweeter dome. .As a public speaker in the low frequency would require the speaker unit has a wide range of piston vibration appears split without vibration, to ensure the ideal point and phase characteristics. .The Company under the requirements of enthusiasts seeking bass, but also have developed dumbbell speaker enclosure, with two 8-inch or 6.5-inch woofer sandwiched between a dome tweeter, designed to strengthen the bass. .Three-way loudspeaker Speaker: In the two based on the frequency increases a midrange unit, the advantage of full use of the piston oscillation frequency of each unit, reduce distortion and improve the capacity of the power crawl. .Another distinctive feature of AV speakers are leak-proof with good magnetic properties, magnetic circuit must be designed with magnetic shielding to ensure that does not affect the video image. .<BR> <BR> Today, the popular multi-dimensional stereo and home theater systems refers to the theater's audio and visual effects show up in the general family, surround sound is a part, and a very important part. .Now the market popular surround sound roughly divided into two, one is from the early "four channel" evolution to the Dolby Pro Logic surround sound; the other is the company first developed by the YAHAMA DSP surround sound. .DSP digital surround sound processing technology is used to simulate the different spaces (such as a single movie theater, concert hall ... ... and so on) of the sound. .This requires the front, center, rear speaker sound to balance the indicator, directional to be ideal. .Electro-acoustic industry engineers to improve AV speakers performance made unremitting efforts, through system design, experimental and simulation and other means to continue to explore AV Speaker of the world mystery, to ensure the sense of hearing, based on the sure that the speaker of objective parameters .occupy an important and necessary position. .Representative of the products, such as JBL's speaker home theater speaker system, including pre-main-channel, center channel, surround channels and subwoofer were seven speakers. .The main channel with two front 200mm bass units, two 127mm midrange units, a titanium dome tweeter and horn tweeter. .Movie mode with horn-style tweeter. .Movie mode with horn-style tweeter, listening to music using titanium dome tweeter diaphragm. .Playback sound design is very comprehensive, multi-channel audio equalizer and 7-channel audio equalizer, the use of digital technology in a smaller space to create a magnificent home theater sound. .<BR> <BR> 1.3 Subwoofer <BR> <BR> in the past, in order to achieve a true subwoofer output, the designer as much as possible using large cone. .Companies such as 27 inches KLIPSCH subwoofer; EV company developed the 30-inch cone subwoofer and so on. .In recent years, home theater audio market boom driving the subwoofer with large amplitude in the research and development. .Representative products are: AURASOUND company radial 18-inch neodymium magnetic system subwoofer. .By controlling the thickness of the roof and in the 2-inch long magnetic gap with 0.5 inch voice coil, in order to obtain a larger range of linear motion. .PINEER's subwoofer has a unique undertaking, from the outside, one might think that it is not surround, in fact, it will surround the structure similar to paste in the diaphragm, the diaphragm can allow the framework for the cylindrical .long piston. .The subwoofer cone before and after exercise can be up to 2cm, 6-inch woofer, while up to 100dB SPL at 50Hz, which is a traditional subwoofer is difficult to achieve. .Representative products, such as the KEF's AV1 active active subwoofer. .<BR> <BR> 2. Of foreign-known large companies main features of the speaker box and a unique new technology <BR> <BR> 2.1JBL company <BR> <BR> speaker features are: Power Handling large ,200-300W; sensitivity .high, more than 110dB SPL; good frequency response, flat frequency response and excellent transient characteristics. .<BR> <BR> Unique new technology: <BR> <BR> (1) Speaker of the magnetic core with a very low frequency speaker thick pole core is hollow, which was covered with lines cut into the type of veneer. .The magnetic core can be specially designed to reduce the weight of the speaker, heat dissipation, designed to increase power endurance. .<BR> <BR> (2) flat wire voice coil as an advanced technology the company invented by JBL. .Initially used in the subwoofer, the tweeter was also widely used, both aluminum and copper. .Flat line of duty factor, high utilization rate of the magnetic gap to improve the sensitivity. .According to the test, in the same magnetic circuit, the flat wire voice coil than round wire voice coil can improve the sensitivity of about 1dB. .<BR> <BR> (3) titanium dome diaphragm type unit, is also the JBL company first began to be successful. .Young's modulus of titanium is superior than aluminum, titanium films using high-frequency loudspeaker, high-frequency limit can be larger broadening, a more substantial increase in power capacity. .<BR> <BR> (4) SFG symmetric magnetic field is the titanium diaphragm JBL's patented technology. .The patented technology ensures the magnetic gap and voice coil symmetric FB value of the distribution of upper and lower positions are equal, which contains a flux balance, reducing the driving source inductance and thermal conductivity of the structure set. .Effectively reduce low frequency distortion and improve power-handling capability and damping characteristics. .<BR> <BR> 2.2BOSE company <BR> <BR> speaker box of the company is characterized by: the initiative to use reflective listening environment to improve and modify the sound radiation characteristics of the speaker, the sound development of world-famous speaker box pattern. .<BR> <BR> Bose company's new technology: <BR> <BR> (1) Direct / Reflecting speaker technology. .Using the company's speaker box bose direct / reflecting technology to restore from the walls, ceiling and floor reflections to the audience of voice, use of direct / reflected sound theory and position of the level of performance to be realized. .Representative products are 901,701 and 501 series speakers. .<BR> <BR> (2) gas flow rate bass sound technology. .The technology is the use of "A-cousticMass" flow generated by the structure, the coupling of three separate sound room work, can reduce the woofer diaphragm resonance, lower distortion, while also providing a great dynamic range. .<BR> <BR> (3) Audio waveguide technology. .This technology is the bose of the company after 14 years of scientific research, and applied for a patent. .Characterized by the structure in the chassis to install a very small flapping quite a long bending waveguide, thereby increasing the sense of bass to create a breakthrough in the small box size limits the huge sense of stage space. .<BR> <BR> (4) HOROFINE film. .The film technology is a use of bamboo and wood pulp, with perfect balance of plasticity and rigidity, to meet the high quality acoustic signals into three main indicators: low density, high Young's modulus.and the attenuation index large area re-released in alt bright and clear and very natural sound. .<BR> <BR> 2.3AR company <BR> <BR> the company to create the air cushion known speaker box, this speaker uses acoustic levitation technology, which closed cabinets through the air like a spring to support the .woofer, and access to deep, powerful bass. .The speaker box from the 50's began to appear, are still enduring. .<BR> <BR> 2.4 <BR> <BR> French FOCAL Group to create the company known for its advanced speaker unit, and also produce a variety of styles of speaker boxes, selling products around the world. .Some company has advanced manufacturing technology speaker, an internationally renowned major inventions they have four. .<BR> <BR> (1) invented called "MVF" (elimination of mechanical vibration) system, the new design. .The system can be used to overcome the traditional cone speakers shortcomings of mechanical oscillations, reducing cone vibration intensity to ensure high-fidelity playback split. .<BR> <BR> (2) in the diaphragm design has been patented Polkevlar pots, the quality of light and rigid, completely solved the problem of coloration, frequency response and accurate. .<BR> <BR> (3) invented the Polyglass (polyethylene glass) treatment cone, the cone with high rigidity and excellent internal damping properties, so smooth and natural sound elements, detailed and accurate music playback. .<BR> <BR> (4) 90's successful development of new diamond diaphragm, can be re-broadcast the gorgeous sound. .<BR> <BR> Speaker of this company is characterized by high sensitivity, most of the products are more than 90dB. .Midrange and tweeter installation panel coaxial line, can produce accurate audio and video. .<BR> <BR> 2.5 <BR> <BR> Danish DALI company attaches great importance to the company to listen to the speaker testprogram, no single objective test results as final. .The company has a wealth of practical experience, a professional quality music to listen to people who measure the composition of the jury, for the DALI sound quality of each new product to the subjective assessment to ensure that the DALI product-specific style. .<BR> <BR> DALI speaker company is the most significant features: a narrow front panel as much as possible, control the sound dispersion; box is very hard, with a surface absorption layer devices, can effectively eliminate the resonance, the sound field stability, a sense of stereo positioning .very accurate. .Speaker units are used in the test by computer matching. .<BR> <BR> 2.6 Characteristics of the British <BR> <BR> TANNOY speaker coaxial speaker company known for the successful solution of the phase distortion problems; KEF company invented the "UNI-Q" coaxial technology, the treble .coaxial with the bass sound and the ideal point to make as accurate stereo; QUAD company specializing in electrostatic speakers, has spared no effort to improve and develop it; Celestion and Rogers's small speaker in the 2000Hz 2dB when the test curve of the bulge, it was considered .This small difference will certainly affect the sound, but the two company's products is the representation of the British small box products, which may be the secret of the British sound of the tone. .<BR> <BR> 2.7 new flat panel speaker <BR> <BR> verity companies and NCT British company, in 1996, has announced the successful development of a novel ultra-thin flat panel speaker, the speaker is indeed a major breakthrough in production technology. .<BR> <BR> Such flat panel speakers, the thickness of the thinnest as 3mm, the thickness of not more than 25mm, the effective radiation area size can be determined with the design, from 25cm2 to 100m2. .Verity's NXT speaker uses a electromagnetic drive,the NCT company uses piezoelectric actuators. .Vibrating plate with carbon fiber and paper materials, speakers, very light weight. .Frequency response of a wide range of speakers, referring to the sexual angle, good sound quality, this flat-panel speaker does not need box, can be like a picture hanging on the wall or mounted on the ceiling. .Experts predict that: ultra-thin flat panel speaker applications such prospects, a new generation of the 21st century will be the speaker. .<BR> <BR> <BR> <BR>.