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TC electronics and Lexicon effects 
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TC electronics and Lexicon effects  Frequencies between 250 and 3,000 hz, the frequency range of ordinary telephones, are normally sufficient. A few speech sounds, such as th, require frequencies as high as 6,000 hz. For high quality reproduction, however, the range of about 100 to 10,000 hz is necessary. Sounds produced by a few musical instruments can be accurately reproduced only by adding even lower frequencies, and a few noises can be reproduced only at somewhat higher frequencies.
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TC electronics and Lexicon effects Articles Tungsten filaments were substituted for carbon filaments in incandescent lamps in 1907, and gas-filled incandescent lamps were developed in 1913. This is a measure of how well a power amplifier can control the reactive load of a loudspeaker. In the original hammond organ, built in 1935, these sine waves were generated using revolving tone wheels which induced a current in an electromagnetic pick-up. In all high-fidelity systems, the crystal pickup has been replaced by the magnetic cartridge using either a moving magnet or moving coil mechanism. Sound pressure level (spl) - the loudness of an acoustic wave stated in db that is proportional to the logarithm of its intensity. Each amplifier powers a loudspeaker for a specific frequency range. Invented by thomas edison in 1877, the phonograph was a device with a cylinder covered with a soft material such as tin foil, lead, or wax on which a stylus drew grooves. The number of cycles per second, or hertz (hz), is known as the frequency of the oscillation. The appearance of the fairlight cmi in 1979, the first well-known digital instrument capable of sampling, started a revolution. This form of modulation, am, is used in many radiotelephony services including standard radiobroadcasts. Inductance (l) - the capability of a coil to store energy in a magnetic field surrounding it. Use of tape overdubbing was pioneered by les paul and is called 'sound on sound' recording. Fb - the tuned frequency of a ported box. A typical suspension system includes the 'spider', which is at the apex of the cone, often of 'concertina' form; and the 'surround', which is at the base of the cone.
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