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You could boost the bass in Audacity, but the bass response will be so poor that it won't help a great deal - you're likely to just distort the sound.
Signal source - mp3.What is the signal source? An MP3 of sine-wave frequencies?
Hold the mic very close to the speaker so room acoustics are at a low level.
Don't allow distortion which contains higher frequencies.
No, on the contrary: audio samples containing low frequencies cause sound distortion on phone speakers, so I am trying to get rid of low frequencies.