These are bipolar tower loudspeakers produced by Definitive Technology. They are designed to create a wide and immersive soundstage by radiating sound from both the front and rear of the speaker enclosure. This design philosophy aims to enhance the listening experience by providing a more diffuse and enveloping audio presentation, more closely emulating a live performance.
The significance of this particular model, and bipolar speaker design in general, lies in the ability to create a more spacious and realistic sound field compared to traditional direct-radiating speakers. The dispersed sound can result in improved imaging and a greater sense of depth in the audio. Historically, this technology represents an effort to overcome the limitations of conventional speaker designs in creating a convincing sonic environment within a listening room.