“….for these reasons high quality and high performance electrostatic speakers can only be hand-crafted.”
“Electrostatic loudspeakers have great advantages but also various flaws that have inhibited their diffusion considerably; many of these are due to the fact that it is impossible to produce high-performance electrostatic loudspeaskers on an industrial scale because of high costs and and long processing times. Craftsmanship production can efficiently solve these manufacturing problems.
For these reasons high quality and high performance electrostatic speakers can only be hand-crafted.”
At DEA we use high thickness insulated copper stators, subjected to a special perforation technique and isolated with a high rigidity dielectric coating (90KV). These characteristics avoid the corona effect, i.e. the electric discharge that can be formed between the membrane and the stator when high voltages are applied. All this makes for increased efficiency and dynamic capabilities of our speakers.
Traction of the membrane
DEA loudspeakers are equipped with specific templates that permit turning on a micrometric scale. Also at the end of the traction process the membrane is subjected to a special treatment that eliminates the mechanical stress to which it is subjected during traction.
Step Up Transformers
Step up transformers represent the heart of electrostatic loudspeakers. We use oversized transformers (developed after having produced hundred of prototytpes) that interface directly with the stators without the interposition of cross-over network or guards which normally alter the signal with timbre and distortion.
Also, in our loudspeakers each stator has its own step-up transformer, and this makes it the only bi-wiring electrostatic loudspeaker type in the world.
Structure is another important element, not only because it affects the resonant frequency of the system but also because it contributes decisively to the achievement of a perfect azimuth. In fact, structures support the stators and can create significant alteration to the azimuth if they are not perfectly planar. We use high quality plexiglass structures worked with very low tolerance, computer numerically controlled (CNC) milling machines.
The membrane must be powered in the most ideal manner possible to obtain a correct azimuth and to not limit the dynamic capabilities and efficiency of the loudspeaker. It is therefore necessary to use polypropylene condensers, ultra fast diodes, and high quality power transformers. Many manufacturers are convinced that the correct powering of electrostatic loudspeakers is superfluous due to the power of polarization of the membrane being just a few milliamps.
At DEA we have developed a special panel, whose membrane, vibrating with the reflected sound wave, is able to extend low frequencies, in a totally passive manner. This improves significantly the entire frequency range because it mitigates excessive displacements of the active panel membrane.