主题：动圈式扬声器和话筒的曲线趋势调整方法

The mechanic tuning of the loudspeaker usually shifts the main resonance

to the low end of the transmitted frequency range. Spherical waves are predominately

emitted in this frequency range, and, below a limiting frequency

Tuning the mechanic resonance to lower frequencies extends the range. The

Electric equalization using the techniques discussed here can overcome

the mechanic deficiencies of the loudspeaker, but be aware that very large

mechanic forces may be needed, reducing the power efficiency. Monitoring the

movement of the membrane with sensors and controlling the driving force

distortions – particularly at the lower end of the frequency range.