By CNET News (CLICK to read more)
"Dynamic range compression isn't new, it's been used by recording, mixing, and mastering engineers for many decades. A little bit of compression is fine, but over-compression can sound downright ugly. Most of today's music, whether it's on LP, CD, the radio or iTunes is over-compressed. Most remastered CDs are over-compressed.
Before we go any further, I'm not referring to the lossy compression used in MP3s, or lossless compression used in Apple Lossless. They've got their own set of problems, but dynamic range compression is a very different predicament.
To the casual listener compression can sound 'good,' mostly because it makes the music seem louder and punchier, and once music's natural soft-loud dynamic shifts are squashed flat music is easier to hear in noisy environments like cars or over iPods. Compression reduces the need to adjust playback volume--because it's always nearly the same volume--loud."
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