The SLA-4.1 90x35 is a compact Frequency Shaded Line Array loudspeaker optimized for 35° (V) x 90° (H) H coverage. It employs a high output ribbon driver on an HF Wave Guide, and four 4” LF drivers within a slim profile enclosure. It is designed to work in highly reverberant environments where uniform horizontal coverage and a focused vertical pattern are beneficial. A sophisticated filter circuit sequentially integrates drivers in the array to maintain vertical pattern control to 900Hz, and ensures a smooth transition from line-source to point-source behavior at lower frequencies. The result is very flat response and uniform pattern control, yielding superior speech clarity and musical detail.