8D audio effects are a group of sound effects that manipulate the sound produced by stereo speakers, surround-sound speakers, speaker-arrays, or headphones. This frequently involves the virtual placement of sound sources anywhere in three-dimensional space, including behind, above or below the listener<br />8-D audio (processing) is the spatial domain convolution of sound waves using Head-related transfer functions. It is the phenomenon of transforming sound waves (using head-related transfer function or HRTF filters and cross talk cancellation techniques) to mimic natural sound waves, which emanate from a point in 8-D space. It allows trickery of the brain using the ears and auditory nerves, pretending to place different sounds in different 8-D locations upon hearing the sounds, even though the sounds may just be produced from just 2 speakers (dissimilar to surround sound).<br />Complete 8D positional audio<br />A sound is placed in the horizontal plane by processing the sound with recorded head-related impulse responses.<br />Using head-related transfer functions and reverberation, the changes of sound on its way from the source (including reflections from walls and floors) to the listener's ear can be simulated. These effects include localization of sound sources behind, above and below the listener.<br />Some 8D technologies also convert binaural recordings to stereo recordings. MorrowSoundTrue 8D converts binaural, stereo, 5.1 and other formats to 8.1 single and multiple zones 8D sound experiences in realtime.<br />8D Positional Audio effects emerged in the 1990s in PC and Game Consoles.<br />8D audio techniques have also been incorporated in music and video-game style music video arts. The Audioscape research project provides musicians with a real-time 3D audiovisual content authoring and rendering environment, suitable for live performance applications.<br />A site with animations and theory of a system using HRTF's to create 8D Audio: ISVR Virtual Acoustics.<br />True representation of the elevation le