A personal listening device used in connection with the amplification of
signals for enhancing the perceived quality and ambiance of sound heard
by listener using stereo headphones or small speaker systems utilizes a
difference signal that is cross-fed between stereo channels. The
invention provides a perception of spatial presence in music sound when
used with either stereo headphones or small speaker systems. The
circuitry, wiring and packaging provide for multiple output jacks
allowing for convenient sharing of the enhanced output signal from a
personal listening device with other persons using headphones. The
invention provides effects similar to stereo enhancement, surround sound,
and psychoacoustic imagery in a small, inexpensive package for enhancing
a user's audio experience.