Configure your Mac using Vox and Audirvana Free for bitaccurate Audio with OS X
Playing bitperfect-audio with a Mac OS X and is a little bit complicated because Mac-Computers always use a fixed bitdepth and samplingrate in the MIDI-setup. But there is a lot of software available to listen to your HighRes-Files with automatic changing of bitdepth and samplingrate.
Installing OS X
Usually Mac Users do not have to install the OS X, buy any Mac and you will be ready...
However, OS X Version 10.10 (Yosemite) or better 10.6 (Snow Leopard) is recommended for the bit-accurate playback with Mac OS X, because these versions allows the activation of the "Hog-mode" (takes exclusive control of the audio output device) as well as "Integer mode" (directly addressing of the hardware e.g. bypassing mixing buffer, filters) without expensive additional software.
You should not edit, configure or change the BIOS (= "Open Firmware") of your Mac!
Configure OS X for bitperfect playback
To get bitperfect audio with Mac OS X check out the configuration below: