[Chris B.]

aus dem LOGIC manual:

Filter Frequencies Below 10 Hz: When this option is checked, frequencies below 10 Hz
(which are usually not reproduced by speakers, and are not audible to human ears at
any rate) are removed, leaving slightly more data bandwidth for the frequencies
which humans can hear, resulting in an improvement in perceived quality. Only
uncheck this option if you’re experimenting with subsonic test tones, or exporting
MP3s for whales.