The SRX906LA is a compact, two-way, active line array element that can cover a variety of small to midsize applications, including rental houses, touring artists, DJs, and installations. The SRX906LA AF is a lightweight and compact array frame for suspending SRX906LA arrays. This specially priced bundle includes four (4) SRX906LA's and the SRX906LA AF Array Frame. Buy them together and save!