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Change the sample rate of audio on the optical out port System
I used to have my home theater receiver hooked up to my Mac Pro via the optical connection, and for a long time, enjoyed listening to my music in an emulated surround mode through Dolby Pro Logic on the receiver. Since moving into a new apartment, however, I had been using normal stereo mode.

When I finally switched back to my 5.1 setup, I found I could no longer have my music mixed to five channels! For whatever reason, Leopard was outputting my audio at 96 KHz, which was above what my receiver could process. In order to fix this, use the Audio MIDI Setup application found in the Applications » Utilities folder. Use the Properties For drop-down to choose Optical Out, and then down in the Audio Output section, choose 48000Hz for a format. Restart any running applications using audio and play with your receiver; you should be able to use Pro Logic now.
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Change the sample rate of audio on the optical out port | 2 comments | Create New Account
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Change the frequency of audio on the optical out port
Authored by: JonathanBoyd on Apr 10, '08 10:18:27AM

The title is potentially a little confusing as frequency generally refers to the pitch of sounds. 'Sample rate' would be less ambiguous (and easier to find for anyone searching for the hint).

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Change default Audio MIDI settings?
Authored by: caewok on Apr 10, '08 08:23:03PM

If you are trying to play a movie file with surround sound (like AC3), use Quicktime movie inspector (apple-I) to see the Format. On .mkv files, for example, it tells me the file is encoded at 48.000 kHz. Therefore, on my macbook pro, I need to change Audio MIDI Setup from 44.1 kHz to 48.0 kHz to match, in order to get surround sound to work on my receiver (optical port).

Does anyone know how to change the default Format settings in Audio MIDI? Since I use a laptop, Audio MIDI defaults back to 44.1 kHz whenever I unplug the optical cord, which is annoying. I can't seem to change the default or write a script that would work.

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