About MP3 Export Options

In addition to the general options for all export formats (see General Export Options), the following options are available when you export as an MP3 file.

Figure. Export dialog with MP3 options.
  • Use Variable Bit Rate Encoding (VBR) checkbox: This setting varies the number of bits used to store the music depending on the complexity of the music. This can help keep file size to a minimum.
  • Joint Stereo checkbox: When deselected, your MP3 files contain one track for the right stereo channel and one track for the left. In many cases, the two channels contain related information. When the Joint Stereo checkbox is selected, one channel carries the information that’s identical on both channels, and the other channel carries the unique information. At bit rates of 160 Kbps and below, this can improve the sound quality of your converted audio.
  • Smart Encoding Adjustments checkbox: Select this to have Compressor analyze your encoding settings and music source, and then adjust settings to maximize quality.
  • Filter Frequencies Below 10 Hz checkbox: Filtering inaudible frequencies results in smaller, more efficient files without perceptible loss of quality.