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Phonographs

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The Phonograph On December 4, 1877 Thomas Edison became the first person to ever record and play back the human voice. The technology that led to the phonograph came from developments that Edison made in the telegraph and telephone. Edison at the time was experimenting with how a moving diaphragm linked to a coil, could produce a voice modulated signal. Meanwhile, he was also experimenting with a telegraph repeater which was simply a device that used a needle to indent paper with the dots and dashes of the Morse code. Out of these two ideas, came the concept of attaching the stylus from a telegraph repeater to the diaphragm in the mouthpiece of a telephone. The first test in July of 1877, involved a sheet of paper pulled under the needle mechanically coupled to a diaphragm, as he shouted into the mouthpiece..... Sadly, It didn't work..... though it did produce an unrecognizable sound which was luckily, just enough to prove the concept and spark intense interest in developing ...
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The Basics Of Loudspeakers By Allan Potenciano

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Loudspeakers come in many different shapes, sizes, and configurations, but they all do the same thing: they convert audio signals into sound waves. Most audio systems include several loudspeaker drivers to reproduce both low frequencies (LF) and high frequencies (HF). From lowest to highest frequency, the most common types of drivers are subwoofers, woofers, mid-range, and high frequency. Loudspeaker frequency ranges When looking into speakers and their technology, reference will be seen to a number of different types of loudspeaker for different frequency ranges. Often some hi-fi speaker systems are made up from a number of different speakers to enable them to cover the complete audio frequency range as it is not possible for a single speaker to cover the whole range. Sub-woofer: The sub-woofer loudspeaker is intended to reproduce the very low frequencies, especially giving a sense of ‘feel’ to the sound. Typically a sub-woofer loudspeaker would reproduce frequencies i...
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