The JBL VT4880 is a high-output, dual 18-inch line-array subwoofer engineered as a dedicated low-frequency component for JBL's flagship VTX line-array systems in large-scale concert touring and major fixed installations. It is designed to be flown or ground-stacked in arrays alongside VTX full-range enclosures, providing the massive, deep bass foundation required for modern music and large-venue sound reinforcement. The subwoofer features two long-excursion 18-inch drivers housed in a cardioid-configurable, vented enclosure. Its advanced design allows it to be deployed in directional arrays, which focus energy towards the audience while reducing low-frequency spill onto the stage and behind the array, resulting in greater front-to-back ratio, improved gain before feedback, and a cleaner mix.

Constructed with a rugged, trapezoidal plywood cabinet and extensive internal bracing, the VT4880 is built to withstand the demands of heavy touring. It incorporates JBL's Differential Drive® technology for high power handling and low distortion, along with precision-engineered rigging hardware for safe and predictable arraying. As a passive design, it requires external high-power amplification and system processing, typically managed via JBL's HiQnet Performance Manager software, which provides detailed control over array geometry, EQ, and limiting. By combining extreme output, directional control, and robust construction, the JBL VT4880 serves as a critical tool for audio professionals who need to deliver powerful, articulate, and controlled low frequencies in the world's most demanding audio environments.