Originally Posted by KraftD1
Hadn't considered the MBP's limits on optical output, if it is unable to do 24/196, sorry if my earlier post misled.
Oh, I wasn't trying at all to attack your post- we're all trying to help. It was more I was having difficulty finding a "definitive" spec on that output jack.
To the OP- if you are set on getting 24/192 to the Fiio without any sort of downsampling or manipulation, consider a USB to SPDIF converter. Models like the hiface Two, Peachtree Audio X1, Musical Fidelity VLINK192, etc support a wide family of sample rates (I think the three here support 44.1/48/88.2/176.4/192kHz) and can in partnership with your Mac deliver a bitperfect signal to the E17 for decoding.
A few notes though...these converters run as much if not more than the cost of the E17. Also, if you are using iTunes, I don't believe the audio sampling rate is automatically changed when you play songs of differing rates. You'll need to change the supported bit depth/sampling rate in the Audio MIDI interface, close, and restart iTunes each time. Otherwise, if you have it set for 24 bit/96kHz for example, ALL of your songs may be converted to that before being spit out to the E17. Programs like BitPerfect and Audirvana are around to help perform this "switch" for you, but again they cost more money. Again, I don't own your particular setup, but these are just a few items of note I've come across in my research...
*EDIT TO ADD*
To the OP, I'm pretty sure it will downsample, but not 100% positive- it might not play at all if it exceeds the maximum bit/sample rate available as seen in Audio MIDI. Also see my notes above- you might need to take a few steps to make sure the MBP isn't mucking around with the signal before delivering it to the E17.
Edited by thrand1 - 7/9/13 at 10:04am