What is a Sweet Spot?
Sporting origin
The term originally referred to various pieces of sporting
equipment, notably cricket and baseball
bats and tennis
rackets.
When hitting the ball, the bat will rebound, however there is a location along the bat where this force is exactly and completely balanced out by the turning force of the bat. If the ball is hit closer to the end of the bat, the grip of the bat will try to rotate forward out of the batter's hands, whereas if the ball hits it closer to the handle, the bat's tip will try to rotate forward and drive the bat into the batter's hands. There is a small spot called the "sweet spot" where these two tendencies perfectly cancel out. The "sweet spot" location on a given baseball bat varies, however it is typically 6-1/2" from the end of the barrel of a regulation bat.
The sweet spot gives a powerful and clean hit, even though peak ball speed occurs nearer the tip of the bat where the bat is traveling at greater speed of course.
Non-sporting use
The term is now used in other fields to indicate any solution where competing factors produce a favored outcome between extremes.
Audiophiles and recording engineers may refer to a "sweet spot" as the focal point between two speakers where an individual hears perfectly the stereo audio mix, just the way it was intended to be heard by the artist. Sound engineers can also refer to the "sweet spot" of a noise-producing body that may be best captured with a microphone. Every individual musical instrument has its own sweet spot, the perfect location to locate the microphone to get the best sound from an instrument.
Another for instance, is in bridge-building where short gaps can be covered by a cantilever bridge, while deep gorges can be served only by a suspension bridge. In between these two extremes are gaps where the materials needed to construct an arch (for instance) would be about equal to the expense of the cabling needed for a suspension design. This is the optimum point or "sweet spot" for the cable-stayed bridge that reduces the cabling and the materials.
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