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You can't throw something away (by converting to MP3 from WAV) and then expect FLAC to get it back.
The information is gone ... period.
You CAN convert from MP3 to FLAC but by then the damage is done.
Some MP3 encoders find the highest frequency and the lowest frequency and then throw those out. So you've already lost those.
The high frequencies are important for music to "breathe." When they're gone the music just sounds kind of dull. Your ears can't really detect them ... but when the freqs are gone it's noticable.
The lows aren't as noticable at first. But it can mean the difference between a kick drum sounding big and boomy to just sounding like a dull thump.
Anyway ... I encode MP3's at the highest bit rate that my disk space affords me. Sometimes 320 but never below 128. They still sound lifeless to me ... but then I don't listen to them all that much. I prefer plain old CDs ...
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