Foobar

If a slick GUI is your taste, Foobar probably won't fit in.

It gives you the Win95 feeling.

It is very flexible, every think can be configured.

Want to try WASAPI? Download the plugin and compare it with standard Vista Direct Sound

Stereo over a pair of speakers or over a head phone are different things.
Over a headphone the image is often to wide.
Try the Bauer stereophonic to binaural DSP. It narrows the stereo image.
Move it in/out of the DSP box during playback to hear the differences.

Hard panned recordings (sixties with the guitar on the LEFT, the bass on the RIGHT) are excellent to demonstrate this DSP.

Is there a difference in sound between WAV and FLAC, 48 kHz and 96 kHz?
ABX them!