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　　On this issue, you may be misled by the illusion of two. First, the size of the gain caused by the machine illusion. Second, the potential of the properties caused by the illusion. The following description of the secret to the potentiometer problems.
　　Potentiometer is a strength of the signal changes of parts, rotary potentiometer process is actually changing the attenuation coefficient, the minimum position is 0 and the maximum position is 1. However, during rotation at a position corresponding to the attenuation coefficient of each potentiometer are not the same, such as spin-half position when it is not the attenuation coefficient is 0.5. If the spin is half half attenuation coefficient, attenuation coefficient spin 1/4 is 1/4, the potentiometer is called linear potentiometer. But people have long found their own human ears sense of volume is not linear, the signal is attenuated by half sounds not feel it is half the size, in order to make this decay process can meet the characteristics of the human sense of hearing, so he With the exponential nature called potentiometer appears. Index performance characteristics of the first slow after the fast attenuation characteristics, but because it is offset by the nonlinear human ear on the sense, but to make sense of hearing was a uniform. So classic circuit design theory, volume potentiometers are exponential nature. If you do use a linear potentiometer volume potentiometer, when the volume is turned up a little bit you will feel great. In the dead of night, unable to get a smaller volume, it was difficult to control the volume. This is because the machine can be quickly reached its maximum power output, in fact, and then further raised to increase the power output of the machine is very limited, even distorted.
　　As said earlier, the index potentiometer, compared with the above linear potentiometer With this potentiometer, the volume in the same position will feel small, but do not worry about the maximum output power of a loss.
　　Potentiometer index is useful to expand the scope of the adjustment, and there is power to the head of the phenomenon or The scope of the distortion caused by compression to a minimum. Therefore, according to the formal design concepts, if linear potentiometer for adjusting the volume to do, is not considered an error is ignorance. However, in order to make people feel the machine is a little power, to put it directly to the point, is to deceive, to win the competition mentioned earlier in this article, some manufacturers still do so.