The Electro-Voice Sx300 is a 300-watt, 12-inch two-way, high-efficiency, constant-directivity compact speaker system with Ring-Mode Decoupling (RMDTM). Through the extensive use of computer-aided design and modeling, Electro-Voice engineers have developed a state-of-the-art professional loudspeaker system.

The high-frequency section of the Sx300 utilizes a molded-in, 65 x 65 constant-directivity horn. This unique pattern contributes to high intelligibility. Vocals sound natural yet cut through in reverberant, noisy rooms. In addition, the coverage pattern is unusually uniform over its range of operation. Sound quality off axis is very well maintained, even at 45 off axis (a 90 total coverage angle), well beyond the rated coverage angle. The horns unique, Varipath throat geometry helps direct driver output to the corners of the room, points of coverage not described in the usual specifications of horizontal and vertical coverage angles, and parts of the audience that typically do not receive the strongest coverage.