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Applying MP3 to dynamically compressed recordings

*** Given the square waves created by many modern pop recordings, I would have no trouble believing that these would be improved sonically by being compressed. ***

Actually, based on my casual observations, the opposite is true.

Take an uncompressed recording, say of a piano solo. Convert it to MP3 using variable bit rate (I recommend LAME at say -v 2). Or maybe Ogg Vorbis at a specific quality level (say 0.6).

Now apply a peak limiter. Convert the peak limited version using the same parameters.

You will find the latter results in a higher bit rate than the former, indicating more bits are required to maintain the same level of MP3 quality.

Interesting, isn't it?

I suspect dynamic compression makes the signal harder to compress - the shape of the transients become more rounded and therefore require more bits to replicate.

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