In reply to:

the radio will always be louder than CDs or MP3s because the radio stations put a compressor/limiter



I wouldn't say always Tony. Have you had a look (and listen) at some of the modern CDs out there? They have almost no dynamic range at all because of the hard limiting used. A lot of it is probably more extreme than even what broadcasters use to prevent overmodulation.

Stu
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If you want it to break, buy Sony!