The sound box of left and right channel sound sound is not balanced, what reason be? How to solve it?

【Abstract】：

1, the sensitivity of loudspeaker of left and right channel sound box is inconsistent, can pass the method that adjusts left and right channel each output level, make sound box sound box is close to agree. 2, left and right channel output power signal is not balanced, can be left and right channel on the input, output gain of various devices in the approximate same index value. 3, often appear sound source left and right sound channel of the average volume level is different, sound box to