Macbook pro 13 Speaker problem

When I listen to music in Mono, it’s supposed to be that the speakers sound exactly the same from both channels. But when I move the balance of the speakers in System Preferences, the left speaker sounds very distorted and muffled and in the right speaker sounds good with a lot of bass.The guitars sound awful in the left channel . there is a problem with my Macbook? or is supposed to sound like that? i just bought it. its a 2012  model without retina display.
Thank you!

Both speakers should work equally well.  I would exchange it for another one if you just bought it.

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