Many FLAC files labeled "lossless" are actually transcoded from MP3s. If you run a spectral analysis, you will see a sharp cut-off at 20-30Hz. A true "Bass I Love You" fix must have significant energy down to 15Hz.
Most amateur rips of this song are driven into the red. Look at the waveform in Audacity or Ocenaudio. If the top of the wave is flat (square-shaped) rather than rounded, the file is clipped. Clipping introduces high-frequency harmonic distortion. Ironically, this makes the bass sound "farty" or harsh instead of cleanly rumbling. flac bassotronics bass i love you fix
To ensure the 20-30Hz region hits hard without blowing your amp: Many FLAC files labeled "lossless" are actually transcoded