Abstract: A high-power omnidirectional electronic speaker array (or “siren”) having a variable number of circular chambers vertically arranged on a rigid mast. Each chamber, or module, contains one or more manifolds that serve as waveguides for the sound energy emanating from audio compression drivers. Each manifold combines the output of two or more compression drivers into a single source, and maintains a smoothly and exponentially increasing cross-sectional area for the full length of the waveguide to an output port located close to the center of the module. The curved external surfaces of the upper and lower sections of adjacent modules continue the exponentially-increasing cross-sectional area to create a horn-shaped final output mouth for the sound energy. The separation between vertically adjacent exiting surfaces of multiple modules is minimized for the purpose of improved intelligibility, maximum acoustic range, and lower distortion.