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Compression reduces the bitrate. A 50 MB WAV becomes 5 MB in MP3 128 kbps, with barely perceptible loss on standard headphones. At 320 kbps, the human ear can no longer tell the difference from the original.
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Compression reduces the bitrate. A 50 MB WAV becomes 5 MB in MP3 128 kbps, with barely perceptible loss on standard headphones. At 320 kbps, the human ear can no longer tell the difference from the original.
Bitrate/quality trade-off
320 kbps
Near CD (very good)
Archiving, audiophile listening
192 kbps
Good
Podcasts, everyday music
128 kbps
Average
Audiobooks, conferences
64 kbps
Poor
Dictaphone, voice memo
Compressing an already compressed file (MP3 to smaller MP3) degrades quality more than compressing from a lossless format. Always start from the original source file.
You just recorded a podcast on your phone in WAV (raw format). The file is 120 MB for 30 minutes. Compress it to MP3 128 kbps: you get a 14 MB file, perfect for email or blog hosting.