The PreSonus® CDL12 is the result of years of research and development, combining the best attributes of point source and line array technology into a unique patent-pending design. Based on the Constant-Directivity Two-Way Loudspeaker System design presented at the 143rd AES Convention in New York by Hugh Sarvis and Don Keele, the CDL12 radiates a highly focused pattern with consistent SPL throughout the frequency response range, both on- and off-axis. The result is clear, articulate speech intelligibility and natural music reproduction.