The JBL's STX818S bass reflex subwoofer is a small, high-power low-frequency device with a continuous power rating of 1,000W. This passive speaker has a programme power of 2,000W and a peak power of 4,000W. The 18th century "Front-loaded into the vented enclosure is a Super Vented Gap Cooled woofer. For interoperability with a range of cabling schemes, the system provides input connection flexibility. The contacts +1/-1 and +2/-2 can be selected using a recessed external switch.