27mm High Fidelity dome tweeter with glass fibre reinforced plastic chassis with optimum acoustic properties. The diaphragm is formed from a precoated lightweight fabric using a unique production method developed by SEAS. The technology gives a vast improvement in consistency compared with other coating methods. Careful matching of fabric and coating results in a very smooth frequency response throughout the audible frequency range and gives a very high degree of stability against changes in air temperature and humidity. The voice coil is wound on an aluminium voice coil former with ventilating holes which eliminate problems connected with resonances in the internal cavities. The voice coil is immersed in low viscosity magnetic fluid, allowing high power handling capacity and simplified crossover design. Increased volume under the diaphragm by means of well in the polepiece, lowers the resonance frequency.
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