Ключевые слова:
Public-address systems|Voltage|Electrical impedance|Communication equipment|Magnetic field effects|Control panels|Electrical properties and phenomena|Noise (spurious signals)|Indicator lights|Signal distortion|Headphones|Electrical tolerances|Telecommunication|Frequency response|Signal-to-noise ratio|Performance|Sound intensity|Communication systems (buildings)|Telecommunication systems|Attenuation|Conferences|Dimensions|Electronic equipment and components|Electrically-operated devices|Definitions|Audio systems|Audio equipment|Telecommunication links|Sensitivity|Assembly facilities|Colour|Microphones