you can test it out with the high res multichannel flac downloads here:
http://www.2l.no/hires/index.html
happy listening!
The organ samplers will also fully show off the dynamic range of your system!
In my experience, sometimes iTunes will accept multichannel 5.1 audio files and sometimes it won't. I have not figured out what makes it work and what makes it balk.
Does Pure Music support the playback of multi-channel high rez audio files, e.g., 5.1 channel 24/96 ALAC?
If so, any tips on how you can get these to show up in the iTunes library?