MP3 settings in Logic Pro for Mac
MP3 settings let you control bit rate, quality, stereo mode, and other MP3 options.
Bit Rate (Mono/Stereo) pop-up menus: You can choose bit rates between 32 kbit/s and 320 kbit/s. The defaults are 80 kbit/s mono and 160 kbit/s stereo. These rates offer acceptable quality and good file compression. If you can afford the increased file size, you should choose 96 kbit/s for mono and 192 kbit/s for stereo streams. These settings deliver better audio quality. You can choose even higher rates, but the quality of improvement in bit rates above 96/192 kbit/s is minimal.
Use Variable Bit Rate (VBR) encoding checkbox: Variable Bit Rate (VBR) encoding compresses simpler passages more heavily than harmonically rich passages, generally resulting in better-quality MP3s. Unfortunately, not all MP3 players can accurately decode VBR-encoded MP3s, which is why this option is unselected by default. If you know that the audience for your MP3 files can decode VBR-encoded MP3s, you can select this option.
Quality pop-up menu: Keep this set to Highest whenever possible. Reducing the quality accelerates the conversion process, but at the expense of audio quality. This option is only accessible when the Use Variable Bit Rate Encoding (VBR) checkbox is selected.
Use best encoding checkbox: If you deselect this option, you gain encoding speed at the price of audio quality. Keep selected, unless conversion time is an issue.
Filter frequencies below 10 Hz checkbox: Frequencies below 10 Hz are removed, leaving slightly more data bandwidth for the frequencies that humans can hear, resulting in an improvement in perceived quality. Such frequencies are usually not reproduced by speakers, and aren’t audible to human ears. Only deselect this option if you’re experimenting with subsonic test tones, or exporting MP3s for whales.
Stereo Mode pop-up menu: Choose between Normal and Joint Stereo. Normal encodes the left and right channels separately. With Joint Stereo, audio content that’s the same in the left and right channels (for example, bass guitar or kick drum) is encoded as a mono signal, which reduces the size of the encoded audio file.