Until the introduction of the Mirage M-1 a decade or so ago, all audiophiles knew what dipolar radiation meant. It was an inherent characteristic of flat, planar, enclosure-free speakers in which the rear radiation was 180° out of phase with the front,...

The radiation pattern of dipoles also got the attention of the folks at THX, who embraced it as a useful way of designing surround speakers that produced an enveloping sound but were difficult to locate—both desirable characteristics for film surround...

Until the introduction of the Mirage M-1 a decade or so ago, all audiophiles knew what dipolar radiation meant. It was an inherent characteristic of flat, planar, enclosure-free speakers in which the rear radiation was 180° out of phase with the front,...