A dihedral loudspeaker for use in mirror image stereophonic loudspeaker systems combines a pair of coaxial drivers with variable dispersion circuits and a high frequency delay network. The variable dispersion circuits decrease the amplitude of the electric signal to the indirect or ambient firing coaxial drivers relative to the direct firing drivers. Each coaxial driver combination comprises a high frequency driver in front of a low or mid-range frequency driver. The pair of coaxial driver combinations in each loudspeaker are substantially identical and each is effectively almost a point source of sound energy. The pair of coaxial drivers are located in dihedral baffles of the loudspeaker approximately the interaural distance apart. The variable dispersion circuits allow the loudspeakers to be adjusted such that listeners outside of the area between and in front of the loudspeakers hear an illusion of the sound image coming from the space between the loudspeakers.

In a multi-channel audio circuit, a plurality of input signals are supplied to corresponding amplifiers each respectively connected to speakers, at least one of the input signals being inverted. The speaker connected to the amplifier receiving the inverted signal is connected at a polarity opposite that of the other speakers.

A dihedral loudspeaker for use in mirror image stereophonic loudspeaker systems combines a pair of coaxial drivers with variable dispersion circuits and a high frequency delay network. The variable dispersion circuits decrease the amplitude of the electric signal to the indirect or ambient firing coaxial drivers relative to the direct firing drivers. Each coaxial driver combination comprises a high frequency driver in front of a low or mid-range frequency driver. The pair of coaxial driver combinations in each loudspeaker are substantially identical and each is effectively almost a point source of sound energy. The pair of coaxial drivers are located in dihedral baffles of the loudspeaker approximately the interaural distance apart. The variable dispersion circuits allow the loudspeakers to be adjusted such that listeners outside of the area between and in front of the loudspeakers hear an illusion of the sound image coming from the space between the loudspeakers.

An acoustic reproducing apparatus is provided which includes first and second channels and first and second speakers, all disposed in a housing with a sound path for acoustically coupling the first and second speakers. The sound path has disposed therein sound absorbing material which forms a low pass filter which operates to add the low frequency signal component of the first channel to the second channel and also operates to add the low frequency signal component of the second channel to the first channel to produce a composite low frequency signal with greater amplitude which is reproduced in phase by each of the first and second speakers.

A multimedia computer speaker system includes a pair of amplifiers that provide amplified right and left audio signals to a pair of wide-band speakers. The amplifiers are configured to provide the amplified right and left audio signals that are out of phase with each other. The amplified right and left audio signals are applied to opposite terminals of the two wide-band speakers. These reversed terminal couplings to the wide-band speakers of the phase-reversed signals provide phase-aligned right and left audio playback at the speakers. A subwoofer and a low pass filter are connected as a bridge-tied load to receive the amplified right and left audio signals. The phase of one amplified audio signal is in effect reversed by applying it to the negative terminal of the subwoofer. As a result, low frequency components of a phase reversed amplified audio signal are summed by the subwoofer with low frequency components of the other amplified audio signal to provide a low frequency audio playback.