Another brand new family is the MW/ND. This new model incorporates a greatly improved dissipation heat system, which allows it to withstand an unexpected power handling from smaller voice coil sizes. This allows for an improved transducer at a lower cost. Apart from this, the models have a sensitivity and efficiency rarely found in this type of speaker. The family will be composed of a 10", a 12" and a 15" speaker.
Beyma will introduce a new type of component. This type of high frequency transducer is based on the AMT technology (Air Motion Transformer). In this type of transducer, invented by the German physicist and Nobel laureate Oskar Heil, the generation of the sound takes place in a very different manner from the habitual one in ribbon tweeters. The diaphragm is formed by longitudinal folds, like in an accordion. In the straight face of each one of these folds, there is a printed conductive copper thread.
This diaphragm is made by Beyma, on a flexible material able to support extreme temperatures.The operation principle is the same of that in a regular tweeter. When an alternating electrical current circulates along the copper tracks of the membrane, a movement takes place in the folds from left to right. The sound wave is generated when the air between the folds is compressed. The displacement of each fold very small, and the air moves at great speed, producing an important sound pressure. The advantage of this type of tweeter is that the radiation surface is four times the one of a tweeter or an equivalent compression driver, due to its folded geometry.All these characteristics make the TPL-150 an authentic alternative to the conventional compression drivers, contributing added value to any sound system that incorporates it says the company.
(Chris Henry)
