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The balance between the left and right channels of the amplifier means no bass. When a channel is off, its bass is so beautiful. What caused it?
This is because the positive and negative poles of the speaker are connected in reverse. The bass phase will reverse, cancel each other out, and the bass will feel weak.
Listening to a speaker alone, the bass is fine and does not cancel each other out.
Check the wires of the two speakers carefully to see if one of them is connected backwards.
As long as the positive and negative poles are the same, the bass is good.