Hi Res audio and macbook

Hi noob here, having a problem getting hi res music files to play in hd. My macbook has optical toslink and USB out. Presently using optical out to my DAC which has optical, USB, coax and BNC inputs and will recognise flac, wav, 24/96, 24/192 etc.
I have several hi res files in itunes, audacity and songbird, some have been converted to wav and info shows they are held as hd files. Problem is my DAC shows that they are not being output as hd so I'm only hearing 16/44.
Can anyone help, please?

Unfortunately, you're kind of in the wrong forum topic - this is Movies and Video, I think you probably wanted to post in Music, Audio, and Podcasting - Mac-Forums.com which is where you'd be more likely to find the audio experts that would probably know this stuff off the top of their head or already have references to good resources....

But after doing a google search on 24 96 iTunes, there were many links including this one:

itunes and hi-res music | AVguide

and

24/96 Player for Mac besides iTunes - Head-Fi: Covering Headphones, Earphones and Portable Audio

It looks like you need to convert the files into Apple Lossless if you want to get that level of playback through iTunes, or in some of the other links, they talk about itunes able to convert/use FLAC audio.

I'd suggest doing some google searches like:

24 96 itunes - Google Search
apple lossless - Google Search
apple lossless converter - Google Search

Oops! Said I was new here. Thanks for your help, have re-posted in proper place.

No worries, we don't bite too hard It's not that I didn't want to help - more suggesting where you might get a better response, honestly, I know nothing about hires audio, and the most I've learned was from those searches I had done to see if I could understand what you were having an issue with I'm sure you'll get some quality help from the audio gurus!