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A record is an analog sound medium that consists of a flat disc record with an inscribed modulated spiral groove usually starting near the outside edge (lead-in) and ending near the center of the record (lead-out). The audio content of the record is contained within the spiral groove which extends for more than a half mile. The groove itself is actually narrower than the thickness of a human hair yet is capable of producing the highest frequencies the human ear can detect, to the fundamentals that are felt rather than heard. The audio recording stored in this groove is played back by rotating the record clockwise at a constant rotational speed with a stylus or needle placed in the groove, converting the vibrations of the stylus into an electric signal and sending this signal through an amplifier to the speakers. The normal commercial disc is engraved with two spiral grooves, one on each side of the record.

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