WAV is a useless format if you'd like to enjoy the benefits of Metadata, and is also needlessly fat, compared to lossless formats.
At the poster above who heard a clear difference between CD and other formats. It is incredibly important to even the volume output on both sources, while playing back. That's more critical than using the same DAC.
But if your treble/bass settings aren't identical, and if your volume isn't the same with both sources (that is, the sound pressure level produced by both sources is not the same) then you will be hearing differences due to different EQ and sound pressure level, and not differences in your sources.
SPL needs to be within 1dB, and ideally should be within 0.5dB or less. Any comparison that doesn't take this into account is useless. Generally, the louder source is preferred, and described as "more open, spacious, detailed, vibrant" etc., even when playing back from the same source, but just with different sound pressure levels.