Sound ReproductionWharfedale Wireless Works, 1953 - 368 sivua |
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9 cu.ft amplifier amplitude Audio Engineering baffle bass unit bias C. E. Watts capacitor capstan centre chapter characteristic circuit cone resonance crossover frequency crystal pick-up damping db per octave Decca diameter disc distortion effect flux density free-field frequency doubling frequency range frequency response groove harmonic Helmholtz Resonator high frequency horn improved increase inductance intermodulation intermodulation distortion kc/s listening loudspeaker low frequencies low impedance microgroove records microphone motor mounted moving coil Mumetal needle obtained oscillator oscillograms panel produced Radiated recording head reduced reflex cabinet reflex enclosure reproduction response curve shellac shown in Fig shows sound SOUND REPRODUCTION speed square wave standing wave stereophonic stylus surface noise tape tapered pipe tests tone treble unit tuned turntable valve velocity vent resonance vibration voice coil voltage waveform wavelength wire دو دو دو دو وو وو دو وو وو