The RW-2118 subwoofer is used to supplement the low-frequency performance of the full-frequency series speakers. The Rw2118 subwoofer is designed to eliminate the effect of resonance and flutter on the high impact transient response. The speakers are all made of 18mm hardwood plywood, and treated with heavy pressure and reinforcement to achieve a strong bass effect. The metal connectors in the inner part of the cabinet connect the cabinet together to improve the reliability of the cabinet. The built-in 2x18 bass unit has super low-frequency impact force.