CLA-18SK is the sub woofer which 18" premium high output driver is settled can be used with CLA-8K or can be used by itself. The cone type woofer driver that has high output and used Long-Excursion method of CLA-18SK is settled on the front panel and the reflect sound on back side is designed for helping reinforcement of low level by fort. CLA-18SK is can be used for diverse types with full range of CLA-8K speaker. The frying type is possible when CLA-18SK is settled on top of CLA-8K speakers and ground stack is also possible if the CLA-18SK stand on the ground and then put on CLA-18SK. CLA-18SK can be used as subwoofer for reinforcement of low sound with CLA-8K when it set up on the bottom depend on needs.