The factors which affect the SPL: the square measure of diaphragm, the amplitude of vibration, magnetic field intensity, power, impedance, resonant chamber, the pattern and the thickness of diaphragm, and the holes.

• 音量会影响声音大小的因素:膜片面积；振幅；磁场强度；功率；阻抗；音腔大小；膜片花纹/厚度；开孔.