Gemibook pro N5100 Speaker

Did none of the owners notice that in this model the two speakers are connected in antiphase?
After checking it, I opened the pc and inverted the two wires (red and white) of one of the two speakers. Voices and low mid frequencies are now reproduced much better.
I also made the comparison with the gemibook pro 13 " which has the same speakers and the sound reproduction is now similar.
Fortunately, this problem is not present when listening with headphones.