ELECTRET ELECTROSTATIC HEADPHONES
In the mid-1970s permanently polarised or electret elestrostatic headphones made their appearance, with Sennheiser Models 2000 and 2002. While the need for a mains powered h.t. supply had been eliminated, they still need an external black box containing twin step-up transformers, to permit operation from the amplifier voice coil output terminals.
Fig. 3.8 Difference between dynamic and electrostatic headphones
In fact, Sennheiser made a virtue out of necessity by arranging for the adapter to feed two separate pairs of electrostatic headphones as well as providing loudspeaker/headphone switching. The company ...
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