198-4 Rectangular Enclosure for 4" Loudspeakers by Atlas Sound is a budget friendly yet durable protective enclosure for a 4" diameter loudspeakers and will accommodate standard screw-mount baffles. Each unit are welded CRS construction, finished in black enamel, and are undercoated to eliminate mechanical and acoustical resonances which provides a good quality of sound. 198-4 is are also furnished with four compound conduit knockouts and are finished with black enamel.