 Contrary to the flat appearance of the loudspeaker, all three panels are slightly curved along the vertical axis to improve quality. The panels themselves are flat, but obtain their curvature by being slightly bent to a curved backing. With the bipolar nature of the speaker emitting sound from both front and back surfaces as it does, the application of a felt sheet to the rear of the panels damps and absorbs high frequencies radiating from the back. A crossover network, set at 500 Hz, remains necessary to adjust for back-to-front interference causing loss in output at low frequencies. In addition, the speaker should stand in free space to achieve optimum sound. The instructions book contains advice against placement of the speaker in corners or positions close to or parallel with walls, and further explains that a corner placement will adversely affect bass response and be detrimental to the midrange because of standing waves generated.
