Box by Suspending Low-Frequency Resonant System
Traditional closed box

Traditional 40mm speaker's frequency generally between 150Hz-180Hz, so the frequency of mini speakers are generally in the range 150Hz~20KHz, apparent from the graph you can find in this range the green curve is higher than the red curve 5dB or so, it means that speaker which uses Suspending Low-Frequency Resonant System produces bigger sound than the traditional closed box speaker.

Ordinary mini speaker output sound depending on vibration of its outmost diaphragm, due to short of enough amplitude and area for vibrating,
frequency of the bass is insufficient and strength is weak, music cannot be expressed perfectly.

The feature of Suspending Low-Frequency Resonant System is that it uses a special TRS suspension technology of speaker hung up, which owns the ability to produce double diaphragm resonance, thus makes the vibration amplitude and vibration area increase, resulting in low frequency sufficient strength bursting.

Box by Suspending Low-Frequency Resonant System
Traditional closed box

The impedance curve of suspension structure box is a bimodal curve, and in terms of this type of curve, the structure of speaker can overcome the driving problem of frequency subsidence. Several times higher than the
average impedance which means sound is very easy to drive and produce more powerfully. That is to say, speaker which uses Suspending Low-Frequency Resonant System produces more powerful sound and more
easily driving than the traditional closed box speaker.