apparatus for use in processing audio electronic signals to create an expanded audio image from playback of the audio signals through speakers; stereo receivers and amplifiers; tape decks; car stereos; televisions; portable stereos; boomboxes; stereo processors for use in cinemas; video disc playback and/or recording apparatus; audio disc playback and/or recording apparatus; home audio-visual recording apparatus; laser disc players and recorders; VCRs; digital video tape players; speakers; speaker systems containing a sound transducer and an integral amplifier; CD (compact disc) playback and/or recording devices; mini-disc playback and/or recording apparatus; motion picture projectors; computer software for expanding an audio image generated by speakers for use in the entertainment field; computers; computer sound processing cards; industry standard computer interface cards; pcmcia cards; computer audio processing circuitry; computer hardware, namely computer diskettes, computer floppy disks, hard discs, magnetic tape, CD-ROM discs, mini-discs, optical storage discs, and computer solid-state cartridges, and CD ROM playback and/or recording devices; audio and/or audio-visual recordings stored on magnetic tape or optical media; audio and/or audio-visual prerecorded media containing entertainment material, namely, motion picture film, VCR cassette tapes, laser discs, video discs, optical discs, analog or digital audio cassette tapes, and analog or digital video cassette tapes