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RE: Problem solved! Getting 24/96 signal out via USB on MacBook Pro

Posted by AbeCollins (A) on January 29, 2015 at 09:49:30

In Reply to: Problem solved! Getting 24/96 signal out via USB on MacBook Pro posted by junkscience on January 28, 2015 at 22:55:20:

I'm glad you solved the problem for your Mac and DAC but I don't think your solution is applicable across the board.

It seems odd to me that your DAC shows 2in/2out. Is it an analog to digital converter and digital to analog converter combo? Why would you set the Line In? My DACs do not show up as having Line In settings.

When I select my DACs as the output device, the volume slider is inactive and I have no choice for selecting anything on the DACs input... just the output sample rate as shown below. This is with my PS Audio or my Oppo DAC.

iTunes does not have the ability to change sample rate to match the sample rate of the file you are playing. If you select 96000.0 Hz as your output sample rate in Audio MIDI setup, all of your files will be sampled to that rate including your lower resolution 44.1 KHz CD rips and higher resolution 192KHz files. Many other players that can be used standalone or in conjunction with iTunes will perform automatic sample rate switching for you, (and bypass Apple's Core Audio for improved sonics.)

Note that my DAC shows 0in/2out (no inputs / 2ch output). If I choose an output format of 96000.0, that's what it starts at but my player (Audirvana+) will automatically change it to match the file that I am playing. If I view Audio MIDI setup after playing a 44KHz file that pull-down selection will have automatically changed to 44100.0 Hz.

Also note that I play my music through the DAC but any inadvertent computer generated alerts and sound effects and such are played through the speakers in my attached monitor via HDMI. These 'computer sounds' are not routed through the DAC (as denoted by the square happy face icon to the right of HDMI device). You can just as easily set these computer generated sounds to go to your built-in output device which would be your computer's internal speakers. This way only music will ever come through the DAC and the rest of the audio system.

My present DAC setup


My Mac summary

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