SB-R1E is a reference-class, passive loudspeaker designed around a point-source layout. It uses a coaxial flat two-way driver for phase-accurate sound, a wide-band response, and a 16 cm long-stroke woofer to minimize distortion. A high-quality network and a rigid, round-form cabinet support precise reproduction. Specific frequency response, impedance, and dimensions are not published in the available data.