The primary technical goal of judging the quality of the speaker system and personal experience to judge the quality of the speaker: The quality of the overall technical objectives of the speaker system depends on the quality of the function of each unit itself, if the technical objectives of each unit in the system are higher, then the technical objectives of the whole system are very good. There are six main technical goals: frequency echo, signal-to-noise ratio, dynamic scale, distortion, transient echo, stereo separation, and stereo balance.

Frequency echo: The so-called frequency echo refers to the frequency scale when the audio equipment is played, and the fluctuation of the sound wave is related to the change of frequency. Generally, the frequency fluctuation of 1000 Hz is used as a reference for detecting this target, and the fluctuation of its frequency is indicated in decibels (dB) as logarithmic. The overall frequency response of the audio system is theoretically required to be 20-20000Hz, which cannot be reached in actual use due to the circuit structure, the quality of the components and other reasons.

But generally to reach at least 32-18000Hz. Frequency response scale refers to the scale of the loudspeaker replayable frequency band, generally used Hz~kHz to indicate. Because the limit scale of the human ear to the frequency is 20Hz~20kHz, with the increase of age, the hearing of the human ear will drop to about 25Hz~16kHz. Therefore, as a pair of excellent speakers, it is of course necessary to reach or exceed this scale of frequency response.