JBL VT4883 Subwoofer

From the Manufacturer

The VT4883 Subcompact Dual 12″ CardioidArrayable Subwoofer Line Array Element is a companion low frequency extension for the VT4886 subcompact 3-way enclosure. Designed to deliver high quality sound reinforcement of sub-low frequencies for a wide variety of live music and A/V support applications, typical uses include concert audio and multi-media presentations of all types. The VT4883 is a subcompact subwoofer housing two 12″ long-excursion, Differential Drive® low-frequency transducers. These advanced components, each fitted with dual voice coils and dual magnets, provide an exceptionally high output power-to-weight ratio. The PlyMax® enclosure features: unique vented bandpass topology with optimized component density and minimal footprint; large area corner ports with laminar flow design for reduced turbulence noise and optimized linearity; integral rubber feet, keyed for aligning surfaces and preventing slippage of stacked systems; pole mount socket for use with optional extension rod. VERTEC suspension systems are engineered for maximum support strength and flexibility. The VT4883’s suspension hardware relies on quick-release pins and side-mounted suspension tubes to couple units together in rigid arrays, either front-firing or rear-firing for implementation of gradient cardioid configurations. Suspension tubes are made from premiumgrade heat-treated aluminum, hinge bars are plated high tensile steel and quick-release pin restraining lanyards are plastic-coated stainless steel to resist corrosion. Subwoofer Line Arrays: The low-frequency capabilities of a multienclosure VT4883 array will be determined by the total number of units coupled. The directivity of a subwoofer line array at any given frequency is proportional to the product of frequency and length of the array. The beamwidth will be inversely proportional to the product of the array’s length and the frequency of interest, typically 20-80 Hz for subwoofer applications. The more subwoofer elements that are used in the array, the greater directivity will be at lower frequencies, enabling better pattern control. Medium to large arrays can generate extreme amounts of sub-low frequency energy.