The JBL's PRX418S is a passive 18-volt system features a selenium 457 subwoofer is housed in a front-loaded, vented enclosure. This passive speaker can handle up to 3200W peak power and 800W continuous power. A pair of Neutrik combo jacks accept both speakON NL-2 and 1/4" audio inputs on the input panel "Parallel wiring of TS connectors. Pins +1/-1 of the PRX418S are linked to the woofer by default. The enclosure is made of multi-laminate birch/poplar hardwood and is finished with JBL's tough DuraFlex coating. The CNC-machined 16-gauge steel grille ensures precision. To provide additional driver protection and a professional appearance, the grille is inside lined with an acoustically transparent screen.