保定市铝带厂

At present, the sale of the loudspeaker treble unit is still in the dome design for the mainstream, this is because the technology is mature, but also provide good bandwidth, and the dome tweeter materials include; silk film, aluminum metal, or even expensive beryllium metal etc.. In addition to the mainstream hemispherical high pitch units, there are many different design types of tweet units. Among them, two tweet units are also being used by manufacturers, they are aluminum soprano and pneumatic tweet. The two are very similar in appearance, and are also rectangular design and protective cover. What is the difference between the two units?

铝带高音单元的开发是由早些年代的铝带麦克风洐生出来，采用方形的外型，但铝带高音是以金属薄膜作为震膜，将薄膜放在磁场中，有电流通过时便会产生振动。由于用铝质制造的金属振膜很轻，所以高频的响应十分出色，最高频率输出能够超出20kHz以上的超高音，但缺陷是容易损坏，所以铝带单元必需要加强保护。

With the development of aluminum tweeters is born by the early years of the strip produce microphone with square shape, but the ribbon tweeter with metal film as diaphragm, the film is placed in a magnetic field, the current through it will produce vibration. Because the metal diaphragm made of aluminum is very light, the high frequency response is excellent. The highest frequency output can exceed 20kHz above, but the defect is easy to damage, so the aluminum strip unit must be strengthened.

铝带式设计能够提供更高的频率输出表现，但在相同技术下，铝带之间所产生的磁场强度比一般高音单元为弱，导致输出的能量较低。但近些年，很多高音单元都采用了钕磁作为永久磁石，增加了磁场强度，增强了高频输出音压，同时亦能够将单元体积进一步缩小，降低生产成本，使一般扬声器也能够使用铝带式高音单元，加上许多生产商也积极推出铝带式高音单元，进一步推低铝带高音的售价。

The aluminum strip design can provide higher frequency output performance, but under the same technology, the magnetic intensity produced by the aluminum strip is weaker than that of the general tweeter unit, resulting in lower output energy. But in recent years, many have adopted the neodymium tweeter as a permanent magnet, increase the intensity of the magnetic field and enhances the high-frequency output sound pressure, and also to the unit volume further narrowing, reduce production cost, make the speaker can use aluminum ribbon tweeter, and many manufacturers are also actively introduced aluminum belt conveyor unit, further push the low price of aluminum with treble.

要使铝带高音单元的高频表现提升，除了使用磁场强度更大之外，亦可减轻震膜的重量，所以部分铝带高音便采用更轻的薄膜如Kapton，加上铝导电膜制造。因此，市面上的铝带高音也不一定是全铝带，而是以合成物料加上金属镀膜制造，英文名称为Ribbon Tweeter，或者以「铝带高音单元」来称呼会更贴切。

In order to improve the high frequency performance of the aluminum tape high pitch unit, besides the greater magnetic field intensity, it can also reduce the weight of the seismic membrane. Therefore, some aluminum soprano will be made of lighter film, such as Kapton and aluminum conductive film. Therefore, the aluminum soprano on the market is not necessarily the all aluminum strip, but is made of synthetic material plus metal coating. The English name is Ribbon Tweeter, or it will be more appropriate if it is called "aluminum tape and treble unit".

而另一种称为气动式高音（Air Motion Transformer）或简称AMT，是由Oskar Heil博士于60年代所研究出来的产品，发声的原理与一般动圈单元或静电单元完全不同。气动式单元是透过一块折的薄膜，并在薄膜底部加上导电金属，在强力的磁场作用下，声音讯号令折的振膜左右来回震动，逼出空气产生声波。由于薄膜有如折扇般折，1吋宽度的AMT之有效面积相等于一个8吋单元的振面，薄膜只需少许移动，便足以输出足够的声压。虽然气动式高音与铝带高音的外形有点类似，但铝带的震动方向与发声方向一致，但气动式高音的震动方向与发声方向则为90度角。

The other is called Air Motion Transformer, or AMT, which was developed by Dr. Oskar Heil in 60s. The principle of sound production is quite different from the general moving coil unit or electrostatic unit. Pneumatic unit is a break through the film, and the conductive metal film in the bottom and, in a strong magnetic field, the diaphragm sound signal to the fold back and forth about vibration, forced air to produce sound waves. Due to the film as a fan like fold, 1 inch width AMT of the effective area is equivalent to a 8 inch unit vibration surface film, just a little move to output enough pressure. Although pneumatic pitched voice is similar to that of aluminum with high pitch, the direction of the aluminum strip's vibration is the same as that of the voicing, but the direction and direction of the pneumatic high pitch is 90 degrees.

气动式高音的历史大约在40年左右。在70年代，AMT的技术正式被应用于扬声器，当时的ESS公司推出了AMT-1高音单元。后来很多公司亦随后开始制作气动式单元，其中较出名的包括ELAC JET单元、Adam X-ART单元、ETON ER4等等。由于采用了磁场强大的钕磁石，使气动式单元的最高频率响应提升至50kHz。

The history of the pneumatic soprano is about 40 years or so. In 70s, AMT's technology was formally applied to speakers, when the ESS company launched a AMT-1 soprano unit. Later, many companies began to make pneumatic units, which were more famous for ELAC JET units, Adam X-ART units, ETON ER4 and so on. The maximum frequency response of the pneumatic unit is raised to 50kHz due to the use of a strong magnetic field of neodymium magnets.

由于低音单元通常需要较大的气流量，但气动式高音单元则需要一个密闭式的箱室，气动式高音单元的设计并不适合设计成为低音单元。另一面，气动式高音单元的制作亦相当考功夫，其中包括折合薄膜，导致单元不能大量低成本生产，所以市面上具备气动式单元的扬声器都是在中、高档产品应用为主。

Because the basalt unit usually needs larger gas flow rate, but the pneumatic high pitch unit needs a closed box chamber, and the design of the pneumatic high pitch unit is not suitable for designing as a bass unit. On the other hand, the production of pneumatic high pitch unit is also quite practical, including folding film, resulting in a large number of units can not be produced at low cost, so the market with pneumatic units speakers are mainly in the application of high-end products.