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acoustical actual adjustment amplifier audio basic bass and treble binaural broadcast cartridges changer circuit co-axial compensatory volume control components control unit crossover curve cycles cylinder device diamond disk recording distortion effect electric current Electro-Voice elements enclosure equalization for records equipment flat frequencies H. H. Scott hall hear heard high fidelity horn inputs instrument Klipsch lacquer less listening low-frequency LP records machine magnetic magnetic cartridge manufacturers material matter mechanical metal microphone mid-range speakers mike monaural motion motor needle noise operation orchestra output pattern performance phonograph piano pickup pitch pivot plastic players playing preamplifier produce Quartet radio RCA Victor record groove reproduction Separate bass shellac sound reproduction sound-system speaker speaker-systems speed spiral standard Stokowski string stroboscope styli stylus surface tape Tchaikovsky tiny tion tone Toscanini treble intensity controls tuner turntable tweeter vibration vinylite watts wire woofer