With an operating range of 35Hz-150Hz ± 3dB, it houses dual 18 long-excursion (460mm)/4 (100mm) voice coil drivers with water-resistant cones and triple roll surrounds. Each driver is rated to handle 1000 watts AES, and has a magnet structure and suspension engineered for maximum linear excursion. The enclosure of the CSX218 is constructed from high-density MDF and coated with hard-wearing textured paint. Eight reflex ports provide a large frontal area to reduce turbulent air noise, and a perforated steel grille protects the drivers from damage with minimal obstruction of airflow. Finished in black (RAL9005) or white (RAL9016) as standard with integrated flying points, the CSX(number) can be also be supplied in any RAL colour to order. When used with CDD full-range systems, crossover and EQ functions can either be performed by the DX0.5, DX1.5 and DX2 system controllers, or by an MA Series amplifier with onboard DSP option.