Take the 2-minute tour ×  Some Windows systems have various
"sound enhancer" functions enabled by default (depending on the
audio driver). This changes all sounds that are sent to the
speakers by applying equalisation and possibly mixing together
the right and left channels of stereo sound for a "better
surround effect".  I would like to know if OS X applies any
similar transformations by default, and if yes, how I can turn
them off.  I need precise control over sound output for a
physics experiment with two speakers. I would like to play a
pre-generated wave file exactly as it is, without any post-
processing. Most importantly, the two channels must not be mixed
at all, and preferably no non-linear transformation should be
applied to single channels either (this is less important
because some non-linearity is unavoidable when the signal goes
through the analog hardware).  Note: The question is about OS X
in general, not about iTunes, which does include a sound
enhnacer. I won't use iTunes for playback.  share