The impedance characteristics of speaker system are very important.

In fact, the impedance of the speaker system is really important, many of the defects on the hearing can be reflected from the impedance curve.  

The main technical parameters of the speaker system are generally marked with impedance, usually 4, or 8, this value refers to the rated impedance, is a pure resistance value, the national standard GB7313-87 is 4, 16, 8. The impedance of speaker system is a complicated problem, it is said that there are no tens of thousands of words, and it is very difficult to understand.