LD System ICOA PRO SUB 21 A Powered 21 High-Performance Bass Reflex PA Subwoofer

Overview

The ICOA® PRO SUB 21 A combines massive bass performance with a smart and road-ready design. This 3000 W powerhouse is a high-performance 21"" bass reflex subwoofer that delivers deep, precise, and powerful bass foundation − ideal for mobile DJs, clubs, live events, festivals, and permanent installations.

The centerpiece of the ICOA® PRO SUB 21 A is its extremely powerful 21"" woofer with a 4.5"" neodymium motor. Thanks to its long-excursion design and finely tuned suspension, this subwoofer delivers an unexpectedly tight, dry, and precise deep bass.

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

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

Two XLR inputs, two XLR outputs, and a powerCON loop-thru connection allow for effortless system cabling and flexible expansion.

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

All settings can be controlled intuitively via the colour display with One-Knob control or through the free ""ICOA PRO"" app. The app enables quick and wireless adjustments and allows you to connect multiple loudspeakers. A stereo setup with up to two tops and four subs, including direct music streaming via Bluetooth 5.1 and TWS, can be configured and set up in the app within seconds. A status LED on the front of the subwoofer simplifies identification and provides feedback on the limiter’s operation when needed.

Thanks to integrated stacking recesses and two M20 pole mounts, the subwoofer can be securely stacked horizontally or vertically for maximum flexibility.

The 15−18 mm birch plywood enclosure is deliberately compact, with dimensions comparable to traditional 18"" models. At just 562 mm wide, it fits perfectly into common transport vehicles (Mercedes Sprinter, Fiat Ducato, Ford Transit, and VW Crafter), even as part of standard transport setups such as Sprinter-Case/TRANSflex next to a subwoofer.

This space-saving design, combined with a durable polyurea coating, makes the ICOA® PRO SUB 21 A the perfect choice for touring and installation applications.

Eight ergonomic handles ensure optimal grip from all sides, simplifying setup and teardown. For long-distance transport, the optional ICOA® PRO SUB CB castor board significantly enhances mobility.

With its compact footprint, powerful deep bass performance, and advanced SysCore® DSP, the ICOA PRO SUB 21 A sets a new standard. Delivering an impressive “Headlining Punch,” it is the ultimate tool for demanding professional applications, including live events, club installations, and mobile DJ setups.

 Features

• 21"" high-power bass reflex subwoofer with powerful low-end down to 29 Hz
• 136 dB max. SPL and 1500 W RMS / 3000 W peak
• Ultra-strong neodymium motor with 4.5"" voice coil for fast and tight response
• 4-band parametric EQ and 6 application presets (incl. low-latency and cardioid functions)
• Free app for remote control via smartphone or tablet
• SysCore® DSP with Advanced limiters incl. temperature and voltage monitoring for maximum reliability
• Adjustable delay for up to 50 meters
• 2 x XLR inputs and 2 x XLR-THRU outputs
• Ultra-robust birch plywood cabinet with polyurea coating and shock-resistant grille
• 8 Ergonomic handles for easy transport
• 2 x M20 threads for distance poles in vertical and horizontal setups
• Securely stackable with 2 x 4 stacking-grooves
• Front LED indicator (identification, power and limiter)
• PowerCON loop-through power connection
• Fanless passive cooling system with airflow-assisted cooling of the electronics
• Optional accessories: Castor board for easy transport and protective covers