LD Systems ICOA PRO SUB 21 A Powered 21" Subwoofer

The ICOA PRO SUB 21 A combines massive bass performance with a well-designed, roadworthy construction. This 3 kW high-performance 21" bass-reflex subwoofer, with its specially developed 21" neodymium woofer, delivers a massive, precise, and powerful bass foundation – ideal for mobile DJs, clubs, live events, festivals, and permanent installations.

The heart of the ICOA PRO SUB 21 A is the extremely powerful 21" woofer with a 4.5" neodymium motor. Thanks to its long-throw design and precisely tuned suspension, the subwoofer delivers unexpectedly tight, dry, and precise bass.

The powerful Class-D amplifier delivers up to 1500 W RMS (3000 W peak), 136 dB max. SPL, and thus enormous reserves and reliable deep bass performance. Four extra-large, flow-optimized bass reflex ports ensure a rich low end down to 29 Hz.

The modern SysCore® DSP with FIR/IIR filters and advanced limiters guarantees distortion-free sound and safe operation even at extreme levels.

With a 4-band PEQ, delay function (up to 50 m) and three selectable crossover frequencies (80 Hz, 100 Hz, 120 Hz), the subwoofer can be flexibly adapted to various setups. Pre-configured presets are already available for low-latency monitoring and cardioid applications.

The intuitive menu navigation is accessed via the color display with one-knob control or with the free "ICOA PRO" app (iOS/Android). The app allows for quick and wireless adjustment of all settings and pairing of multiple speakers. A stereo setup with up to two tops and four subs, including direct music streaming via Bluetooth 5.1 and TWS, can be created and ready to use in the app within seconds. A status LED on the front of the subwoofer provides easy identification and indicates when the limiter is engaged.

Two XLR inputs, two XLR outputs and a powerCON loop-thru connector enable uncomplicated system cabling and flexible expansions.

Thanks to integrated stacking recesses and two M20 flanges, the subwoofer can be securely stacked and flexibly integrated both lying down and standing up.

The enclosure, made of 15–18 mm birch plywood, is deliberately compact and similar in size to an 18" model. With a width of only 562 mm, the subwoofer fits perfectly into common vans (Mercedes Sprinter, Fiat Ducato, Ford Transit and VW Crafter) as part of typical transport solutions (Sprinter case/TRANSflex alongside the subwoofer).

This space-saving design, combined with a robust polyurea coating, makes the ICOA PRO SUB 21 A the ideal choice for touring and installation operations.

Eight ergonomic carrying handles offer optimal grip from all sides and facilitate assembly and disassembly. Transport over longer distances is significantly easier with the optional ICOA PRO SUB CB rolling platform.

Thanks to its compact design, powerful low-bass performance, and state-of-the-art SysCore® DSP, the ICOA PRO SUB 21 A sets new standards. With its impressive "headlining punch," it is the perfect tool for demanding, professional applications such as live events, club installations, and mobile DJ setups.