JBL VT4881A Compact Single 18" Arrayable Subwoofer

The JBL VT4881A is a compact, lightweight vented subwoofer enclosure housing JBL's exclusive new 2269H Ultra Long Excursion 18" woofer. This woofer features neodymium magnet, dual voice coils, JBL's exclusive Vented Gap Cooling and ultra robust composite cone for high excursion and extra long life. The woofer is capable of a peak-to-peak maximum excursion of 89 mm (3.5") while system weight is only 111 pounds.

The enclosure features foam-back perforated steel grille; speaker cone treated with weather resistant compound; rigging tubes and hinge bars made from premium-grade alloy aluminum, plated hinge pins, stainless steel quick-release pin restraining lanyards and inter-locking rubber feet, which allow vertical stacking of multiple units, including reverse ground-stacking for cardioid subwoofer array applications if desired. VT4881A rigging hardware relies on quick-release pins and end-mounted metal frames to couple adjacent units together in rigid but flexible arrays.

The VT4881A can be oriented vertically in suspended arrays or it can be ground stacked in horizontal arrays. The low-frequency capabilities of the multi-enclosure VT4881A array will be determined by the total number of units coupled together. The directivity of a line array at any given frequency is proportional to the product of frequency and length of the array. The beam width will be inversely proportional to the product of the array's length and the frequency of interest, typically 20 Hz - 80 Hz for subwoofer applications. In summary, the more subwoofer elements that are used in the array, the greater directivity will be at lower frequencies, enabling better pattern control.