I had some FLAC files I never played in my MacBook. I figured VLC could play them. I went with my SPIDF out and changed to 24bit 96hz with the Midi control panel and was blown away. Talk about a cheap and cheerful solution to this problem ( I use iTunes). No complaints for me with sound of the free VLC Player. This experiment lead me to download free HD tracks sampler (aiff) which played in iTunes, also 24,96.
Really happy there too. Now if I could only afford high res downloads and Amarra or etc.