Modular line source element has an operating frequency bandwidth from 55Hz to 20kHz. This response can be lowered down to 32Hz with the addition of the SB18 low frequency extension. It features a 2-way, bi-amplified design and is equipped with 2 x 8-inch neodymium LF speakers in a bass-reflex tuned enclosure. The HF section features a 3-inch neodymium diaphragm driver coupled to a DOSC waveguide. The K-shaped coplanar transducer configuration generates a symmetric horizontal coverage of 110° without secondary lobes over the entire frequency range. The combination of coplanar symmetry and DOSC waveguide allows the system to fulfill the 5 WST criteria.