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Telephone headsets are monaural, even for double-earpiece designs, because telephone offers only single-channel input and output. Single-earpiece headsets free up one ear, allowing better awareness of surroundings. Double-earpiece headsets may support stereo sound or use the same monaural audio channel for both ears. Headsets are available in single-earpiece and double-earpiece designs. Stereo computer headsets, on the other hand, use 32-ohm speakers with a broader frequency range. Telephone headsets generally use 150-ohm loudspeakers with a narrower frequency range than those also used for entertainment. 4.1 Digital Enhanced Cordless Telecommunications.
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