S118H subwoofers utilise the brand-new woofers to avoid airflow noises which may occur in ordinary ones when work with ultra-high power, and it’s a vented, small volume enclosure designed with a prepositive horn. The vented hole is designed to be the entrance of the horn, and the frontage of the subwoofer as the exit. This design has excellently enhanced the vented tube’s output efficiency, increased the output of LF, and also decreased the non-linear distortion. Prepositive horn helps to maintain the transient response, speed and thickness in LF at the same time.

Meanwhile, the driver’s magnet part exposes in the horn, which enable the air flow to the magnet and speakerframe directly, so as to effectively decrease temperature in high power condition, and ease the speaker’s power compression.