The Tecnare Cla21Plus is the first of a new family of line source modules which incorporates a new unique technology that seamlessly integrates MF and HF components into a single horn which produces a coherent wavefront without interruptions. At the heart of the Cla21Plus line source module is a new coaxial 4-in voice coil mid-frequency and 2.5-in voice coil high-frequency driver, and covering the 400Hz to 20kHz range. It is loaded to a waveguide and a proprietary horn that ensures low distortion and controlled broadband directivity. With extended frequency response down to 55 Hz, the Cla21Plus LF section houses two 10-in dipolar mounted, high-excursion drive units, 3-in voice coils to maintain long throw projection of low frequencies. The cabinet construction has been made using premium Baltic birch and tour-ready, weather-resistant polyurea coating offering excellent protection and durability. The intuitive property four-point rigging system enhances ease-of-uses which allows angle selection to be made while boxes are stacked on the transport dolly. The Cla21Plus provides a superior performance to live & installed sound market at an affordable and very easy-to-work with package