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Apple Desktops Discussion of Apple's desktop machines including Mac Pro, iMac, Power Mac, and mini

20" Core 2 Duo Surround Sound?


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sneeks

 
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I have my new iMac connected to my home surround sound system via optical out and I can achieve a 2 channel signal from my amp. How do I activate the full 5 channel output for use during dvd playback? These are currenty only playing as 2 channel. The amp does display Optical signal is active.

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Sneeks
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Aptmunich

 
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Check under 'applications->utilities->audio/midi setup' and see if you can tell your iMac to use more channels by selecting 'configure speakers-> multichannel -> number of speakers'.
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sneeks

 
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Thank you for the advice, unfortunately it looks like the iMac will not support my Sony surround sound amp The options for 5.1 are not selectable.
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NanoBite

 
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Sorry to hear that.....you would have been totally cruising with your 5.1 set-up....
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sneeks

 
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The setup I have at home is perfect with all other devices (Xbox 360, dvd player etc) but the iMac does not seem to be able to connect using the full 5.1
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Jem

 
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Interesting... I'll have to double check but I'm using my iMac (Intel, 20" cd) with a Sony surround amp and I'm fairly sure it's doing the full 5.1 output on the optical whenever I use a DVD. I'll take another look tonight...
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sneeks

 
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Thanks, I'll be interested to read your results.
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sneeks

 
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I discovered the answer on the Mac discussion area. Working perfectly now.

In the DVD player preferences there is an option that is available ONLY when a Toslink cable is connected to the iMac. Under Disc Setup there is a box for Audio Output that defaults to System Sound Output. When the digital audio cable is connected there will be a second (hidden) option that can be detected if you click on the arrows next to System Sound Output that lets you choose to pass through the actual Surround Sound information from the DVD. So the required sound preference is not in the OS X System Preference->Sound panel at all. And clicking on the preference on an actual DVD movie (as you would with a standalone DVD player) also does not turn on the surround sound.
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Jem

 
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Excellent, I was just about to post to say mine's working but I don't remember that hidden option, perhaps it defaulted to 5.1 for some reason on my system. Good to hear you got it working though
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