Export to MP3 or WAV intensifies the basses

I recorded a song (guitar + voice) with Audacity 2.0.5 on W7 (Lame is v3.99.3). When I export to MP3 or WAV, the basses of the guitar are intensified and they “roll”, meaning are no more “clean” like in Audacity.
I tried reinstall Audacity with Preferences reset and also Lame but this has no effect.
Do you have an idea of why I face this issue?
Thans and regards, Arnaud

It’s probably your media player boosting the bass when you play the WAV file.
Check that your media player is not applying any effects.