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Why does your HeadRoom Amp have a Processor?
The Processor switch engages and disengages the headphone audio image
processing circuit. Headphone audio imaging is not very good; typically the image is
a blob on the left, a blob on the right, and a blob in the middle. The HeadRoom audio
image processor provides the natural acoustic cross-feed normally heard from the
left speaker to the right ear, and from the right speaker to the left ear. Adding the
cross-feed signal gives your brain enough information to build up the stable and
natural audio image needed to have a quality listening experience.
The end result is a subtle but important change in the sound. If you want you hear it
more dramatically, remove either the left or right input, then as you switch the
processor in and out you can hear the sound move from one ear only to a slightly
forward and up position that synthesizes the sound of a speaker. Most people
should just switch it on and not worry about it.