The 121H is a high-performance sub-bass system specifically designed and engineered for maximum low-frequency output and extreme sound pressure levels.

It features a hybrid configuration combining bass-reflex and horn-loading techniques, housing a single 21-inch transducer with a 4.5-inch voice coil. The system is tuned within a bass-reflex enclosure to extend low-frequency response below the natural cutoff point of the horn section.

This compound design merges the high efficiency and impact of horn loading with the extended low-frequency reach of a bass-reflex system, resulting in a powerful and controlled low-end performance.

Two extra-large ports further enhance system efficiency and extend frequency response down to 35 Hz. This optimized design ensures outstanding sound impact alongside precise and accurate low-frequency reproduction.

Bass response is exceptionally powerful, and the system’s very high SPL capability makes it particularly effective in large outdoor environments, where long-throw performance is essential. It delivers strong, consistent coverage over long distances with ease.

The 121H is primarily intended for large-scale open-air venues, though it also performs exceptionally well in large indoor spaces where high impact, precision, and fast transient response are required.

Built with robust construction standards and advanced materials, the system is engineered for long-term reliability under demanding conditions. The cabinet is made from birch plywood and finished with a durable, impact- and weather-resistant PCP (polyurea cabinet protection) coating.

The 121H integrates seamlessly with high-end professional full-range and line-array systems, significantly extending their low-frequency performance and overall system impact.

Applications: Large Open Air Venues, Arenas, Stadiums, Theaters, Conference Halls, Concert Halls and Large Scale Discos.