OPTICAL DIGITAL AUDIO INPUT SPECIFICATIONS

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Level 1

1 points

OPTICAL DIGITAL AUDIO INPUT SPECIFICATIONS

I'm trying to find out what sample rates the digital optical input will accept as OK. I have a mic preamp that has a Spidif output that can select what sampling rate it sends out. Choices are the normal 44.1, 48, & 96K and 88.2 also. The first 3 rated are industry standards. Ideally I would like to set the sample rate output from the preamp to the rate "prefered" by the early 2009 Mac Pro 8 core if there is one, but I'm unable to find any mention of sample rates used by the Mac Pro input circuit.

The reason I'm asking, is that when I try to set system preferences of sound input, There is absolutely no level indication of an incoming signal when Digital input is selected as you can see in the screen grab below:

User uploaded file

Any help would be appreciated.

Ken

MBP 6,1 17" i7+ Mac Pro octo 16G 7200, Mac OS X (10.6.6)

Posted on Oct 12, 2011 3:55 PM

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Answer 1

kenackr Author

Level 1

1 points

Oct 12, 2011 4:18 PM in response to kenackr

I hope this works this time. Here's the screen grab:

Whadda ya know? It did work!

Ken

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Answer 2

X423424X

Level 6

14,271 points

Oct 12, 2011 5:28 PM in response to kenackr

The reason I'm asking, is that when I try to set system preferences of sound input, There is absolutely no level indication of an incoming signal when Digital input is selected as you can see in the screen grab below:

Take a look at Audio Midi Setup (in your Utilities folder). It may give you more info and control.

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Answer 3

kenackr Author

Level 1

1 points

Oct 16, 2011 6:19 PM in response to X423424X

Thanks for the tip. I had forgotten completely about that utility. Unforntunately, it didn't shed any light on the problem.

Even though I'm a longtime music & audio addict I made the mistake of overlooking the connections making good contact. Both the Mic Preamp and the DIgital audio converter had never been used before just like the new SPDIF cable w RCA connectors. I pushed the cable in until I felt resistance but didn't realize it wasn't fully seated.

After re reviewing my previous steps taken I noticed that the Digital audio converter was not showing a valid source signal. I inspected the connection once again and found I'd made a mistake that many newbies make, not unpluging & repluging connections when chasing down a missing signal.😮

Happy trails,

Ken

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