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LD Systems ICOA® PRO SUB 21 A
Powered 21" High-Performance Bass Reflex PA Subwoofer
- 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
ICOA PRO SUB 21 A: Compact Powerhouse for Deep Bass Performance
The ICOA PRO SUB 21 A delivers earth-shaking bass performance in a rugged, road-ready design. This 3 kW, 21 high-performance subwoofer features a bass reflex construction and a specially engineered 21 neodymium driver, offering powerful, punchy, and precise low-end ideal for mobile DJs, clubs, live events, festivals, and fixed installations.
At the heart of the subwoofer is its impressive 21 long-throw woofer with a robust 4.5 neodymium motor. Its precision-tuned suspension ensures exceptionally tight, controlled, and clean sub-bass performance—even at high output levels.
Driven by a powerful Class D amplifier, the ICOA PRO SUB 21 A delivers 1500 W RMS (3000 W peak) and a thunderous maximum SPL of 136 dB. Four oversized, airflow-optimized bass reflex ports extend the frequency response down to 29 Hz, ensuring a full-bodied low end.
The advanced SysCore® DSP offers FIR and IIR filtering along with intelligent limiters for distortion-free performance and operational safety, even at extreme volumes. Fine-tune your system with the built-in 4-band parametric EQ, delay up to 50 meters, and three selectable crossover frequencies (80 Hz, 100 Hz, 120 Hz). Preconfigured presets are available for cardioid setups and low-latency monitoring.
User control is seamless via the bright colour display with one-knob navigation or wirelessly through the ICOA PRO app for iOS and Android. Easily pair multiple units, configure stereo systems with up to two tops and four subs, and stream audio directly via Bluetooth 5.1 with TWS — all within seconds.
Connectivity includes two XLR inputs, two XLR outputs, and a powerCON Loop-Thru for straightforward system integration and expansion. The subwoofer also features a status LED on the front to indicate limiter activity and aid in system identification.
Designed for versatility, the cabinet supports horizontal or vertical stacking via integrated stacking recesses and includes two M20 flanges for pole mounting. Built from 15–18 mm birch plywood, the enclosure is compact—comparable to many 18 models—measuring just 562 mm wide, allowing it to fit effortlessly in standard transport vehicles like the Mercedes Sprinter or VW Crafter.
Finished with a durable polyurea coating, the ICOA PRO SUB 21 A is built to withstand the rigors of touring. Eight ergonomic handles ensure easy handling, while the optional ICOA PRO SUB CB castor board simplifies long-distance transport.
With its cutting-edge DSP, compact footprint, and outstanding low-end power, the ICOA PRO SUB 21 A sets a new benchmark for professional-grade subwoofers—perfect for high-demand environments such as live shows, club systems, and mobile DJ rigs.
General
- Peak output power: 3,000 W
- RMS output power: 1,500 W
- Amp class: Class D
- Max. SPL peak (sine burst, halfspace/1 m, THD10 %): 133 dB
- Max. SPL peak (pink noise, halfspace/1 m, CF 4): 136 dB
- Max. SPL average (sine burst, BW, halfspace/1 m, THD10 %): 129 dB
- Frequency response (-5 dB, rel. Avg): 80 Hz
- Input connector types: XLR 3-pole female
- Output connector types: XLR 3-pole male
- Protection features: Multiband Limiter, Short circuit, Overheating, Direct current
- Colour: Black
Bluetooth
- Bluetooth® version: Bluetooth® 5.1
- Features: Audio Streaming (A2DP), TrueWireless™ Stereo, TrueWireless™ Mirroring, App control
- Supported audio codecs: SBC, AAC
Inputs
- Number of mic/line inputs: 2
- Mic/Line-in connector type: XLR 3-pole female
Outputs
- Number of line outputs: 2
- Line outputs connector type: XLR 3-pole male
Signal Processing
- AD/DA converter bit depth: 24 Bit
- AD/DA converter sampling rate: 48 kHz
- Min. Signal-to-noise ratio (SNR): 108 dB
Bass Driver
- Size: 21 in
- Outer diameter: 547 mm
- Magnet: Neodymium
- Voice coil: 4.5 in
Mains Operation
- Operation voltage: 100 V AC - 240 V AC / 50 - 60 Hz
- Rated power: 1,300 W
- Power supply type: Switch mode power supply (SMPS)
- Mains connector: Mains socket male power in
- Mains fuse: T10AH/250 V
Housing
- Design: Bass reflex
- Number of handles: 8
- Flange: M20
- Chassis material: Birch multiplex
- Material thickness: 18 mm
- Coating: Polyurea
Cooling
- Cooling system: Convection cooling
Environmental
- Ambient temperature: 0 - 40 °C
- Maximum air humidity (non-condensing): 80 %
Dimension & Weight
- Width: 565.5 mm
- Height: 700 mm
- Depth: 698.8 mm
- Weight: 57 kg