The BOSE's LT9400 is a mid/high-frequency loudspeaker designed for downfill applications in medium to large permanent installations with LT Coherent Zone arrays, or as the principal reinforcement source in smaller arrays and venues with MB low-frequency loudspeakers. This passive speaker with large-format 90° x 40° waveguide offers precise coverage and great intelligibility, making it a cost-effective alternative to multiple-cabinet line arrays.