SU221

Perfect tonal reproduction—and everything else in the vicinity—the CELTO SU221 delivers a monumental 3600 W RMS (14400 W peak) with controlled extension down to 28 Hz and impressive 102 dB / 1 W / 1 m efficiency. This flagship vented dual 21" subwoofer sets the standard for multi-purpose touring and large-scale permanent installations requiring ultimate low-end authority. Designed for stadiums, festivals, arenas, concert halls, and premium nightclubs where flawless, powerful bass is the foundation of the experience. Twin custom 21" CELTO drivers with ±15 mm linear Xmax and patented DCS cooling system provide extraordinary excursion and minimal compression under extreme demand. Heavily braced Baltic birch plywood cabinet with tongue-and-groove assembly and rubberized PolyUrea finish guarantees dynamic, resonance-free performance. Capable of 137 dB RMS / 143 dB peak SPL with precise, musical character throughout its range. Dual M20 sockets and genuine Neutrik Speakon connectors support flexible array configurations and rapid deployment. Optional padded bag, pole bar, and castor kit ensure touring-ready protection and mobility. The SU221 affirms its position as the pinnacle of the SUBIUM series—delivering bass that doesn't just support the music, it defines it.