One thing common to electrostatic loudspeaker designs is the use of extremely high voltage. These kilovolts of energy are connected via a transformer, allowing your amplifier to controls thousands of volts of weak energy. Here is a schematic.
Note the step-up transformer on the left of the drawing. Remembering that transformers haven't any physical connection between their input and output, transferring energy by magnetic forces only, the input coil safely connects any size power amplifier to the speaker's high voltage. On the output side of the transformer, a very high voltage is applied, and this is what generates the electric field that eventually moves the speaker's diaphragm and makes music.
Electrostats can offer a clarity and transparency to the sound unlike just about any other technology. This is because the moving membrane is so incredibly light that transients pass through with little more than a yawn. First-time listeners to an electrostatic loudspeaker generally describe the experience as listing through an opened window.
Though they are quick they are not perfect. Because their diaphragms move so little they require lots of surface area to be efficient and loud. The large surface area causes beaming, which translates in practical terms to a classic phenomenon associated with electrostats known as "head in a vice" syndrome. They are definitely one person speakers.
Tomorrow I'll wrap up this mini-series on speakers offering my opinion on the best of all worlds.
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