The loudness of the hearing aid sound is related to
1 The loudness of the sound is related to the spur of the sound source: the louder the spur, the louder the louder;
2 The loudness of the sound is also related to the distance of the sound source: the closer the sound source is, the louder it is.
3 In addition, the loudness of the sound is also related to the loss of energy in the transmission path: the same, the same distance, the use of a horn, the use of a stethoscope, etc. to transmit sound, less loss of sound energy, loudness.
However, usually consider the above 1, 2 and 2 points.
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