The quality is only as good as the source
converting your original mp3 audio files to a higher bit rate will have no effect. The standard for high quality files are WAV files which can range anwhere from 44.1Khz to 192Khz. Usually in studio recording facilities they will record at a high sampling rate and high bit rate...for example 192khz/32bit. At his rate the audio will almost sound exactly as it was from the source(an acoustic guitar, or vocal track, etc..) given the speakers are of high quality. Usually when a track is done and ready for editing, effects such as reverb, equalizing and compression are applied before converting down to 44khz wav(cd quality), 48khz wav(dvd quality),mp4,mp3, or other compressed file types. You can convert an mp3 to a wav but the quality will remain the same. When a wav file goes thru the encoding process to convert to mp3, data is lost...usually in the high frequency range and lower frequency ranges..these are the least noticeable to the human ear. Once this data is lost it cannot be replaced. Thats why mp3's at low bit rates have are strong in the mid frequency area, but pristine high frequencies tend to be lost and sub low frequencies as well. So the problem is the lost data in the conversion process cannot be put back in. It's gone forever. The only advice I give you is to get good speakers. The funny thing is though, some times good speakers will tend to make your mp3s sound worse because you will hear more detailed sound thru good speakers and you can really tell the true quality of the mp3.
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