Apple Logic Pro 7 User Manual download pdf (Page 290)

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290 Chapter 6 Logic’s Mixing Facilities

Note: Should the selected sample rate be higher than 48 kHz, a temporary copy of the

bounced PCM file is created—with an automatic sample rate conversion to 48 kHz

before encoding. This conversion takes place because the MP3 format does not support

sampling rates higher than 48 kHz.

If the PCM option is disabled in the Destination menu, a temporary PCM file is bounced

as a source for encoding to MP3/AAC and/or burning to a CD—in accordance with the

options selected in the PCM page.

Enabling the MP3 option in the Destination dialog automatically disables the PCM >

Surround option (following a warning message). This is because the MP3 format does

not support surround. Split Stereo format is, however, possible—even if the encoded

MP3 file is set to Joint Stereo mode.

Bit Rate (Mono/Stereo)

MP3 bit rates are selectable between 8 kbps and 320 kbps, but default to 80 kbps

mono, and 160 kbps stereo. These rates offer acceptable quality and good file

compression. If you can afford the extra file size, we recommend selecting 96 kbps for

mono and 192 kbps for stereo streams, as the provides better audio quality. You can, of

course, choose even higher rates, but the quality improvement afforded by bit rates

above 96/192 kbps is nominal.

Use Variable Bit Rate Encoding (VBR)

Variable Bit Rate encoding compresses simpler passages more heavily than passages

that are (more) harmonically rich, generally resulting in better quality MP3s.

Unfortunately, not all MP3 players can accurately decode VBR-encoded MP3s, which is

why this option is turned off by default. If you know that your target listener/s can

decode VBR-encoded MP3s, you can switch this option on.

Quality

Keep this set to Highest whenever possible. Reducing the quality accelerates the

conversion process, but at the expense of audio quality.

Use Best Encoding

Again, like the Quality parameter, if you uncheck this option, you will gain encoding

speed at the price of audio quality. This should always be kept on, unless conversion

time is an issue.

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) will be

removed, leaving slightly more data bandwidth for the frequencies that we can hear,

resulting in an improvement of the perceived “quality”. Only uncheck this if you’re

experimenting with subsonic test tones, or exporting MP3s for whales!

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Apple Logic Pro 7 User Manual Page 290

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