The BOSE's LT9702WR is a high-output, mid/high-frequency loudspeaker designed for use in Coherent Zone arrays in medium to large permanent installations needing accurate coverage and good intelligibility when combined with other LT loudspeakers. The large-format waveguide and 90° x 70° pattern provide a cost-effective alternative to multiple-cabinet line arrays for many applications. For decreased breakup distortion and greater transient responsiveness, this passive speaker midrange manifold combines the output of two 4.5" (114 mm) extended-range cone drivers. When compared to single 8" to 12" woofers, it provides a smoother, more natural vocal range.