- 1500W RMS subwoofer with deep bass down to 29 Hz
- Massive 136 dB SPL output for high-impact sound
- SysCore DSP with cardioid mode and mobile control
- Silent fanless cooling for reliable, low-noise performance
- Durable, stackable birch cabinet with ergonomic handles
The LD Systems ICOA PRO SUB 21 A is a powerhouse 21″ subwoofer designed for extreme low-end delivery and punchy performance in live, DJ or install environments. Offering 1500W RMS (3000W peak), this bass reflex sub reaches down to 29 Hz, ideal for reinforcing larger PA systems. The rugged enclosure, advanced DSP and app control make it both flexible and robust for real-world use.
Deep Bass, Big Impact
The massive 21” driver with neodymium motor and 4.5” voice coil delivers a tight, punchy response with low-end extension down to 29 Hz. With 136 dB max SPL, it’s powerful enough to drive large venues with ease, while remaining musical and responsive for a wide range of genres.
Advanced DSP & Cardioid Mode
SysCore® DSP includes six application presets (including cardioid), 4-band PEQ and adjustable delay settings. Advanced limiters manage voltage, temperature and headroom to protect the driver at high output. The free control app makes setup and tuning easy even when the sub is hidden from view.
Silent, Reliable Operation
Unlike fan-cooled systems, the SUB 21 A uses a fanless aluminium cast heat sink and port airflow for passive cooling. This makes it ideal for quiet stages and noise-sensitive events. It’s housed in rugged birch plywood with polyurea coating for impact and weather resistance.
Road Ready & Stackable
The cabinet includes eight ergonomic handles, M20 pole mounts and stacking grooves for easy rigging. Optional accessories like castor boards and protective covers are available for easier transport and protection in tough environments.
Features
- Delivers 1500 watts RMS power and max SPL of 136 dB
- 21″ subwoofer with neodymium motor and 4.5” voice coil for powerful low end
- SysCore DSP with presets, PEQ, cardioid mode and adjustable delay
- Fanless passive cooling system with aluminium heat sink
- Free app for remote configuration and setup (iOS/Android)
- Stackable birch plywood enclosure with polyurea coating
- Includes 2 x M20 thread mounts and 8 ergonomic handles
Specifications
- Power Output: 1500W RMS / 3000W Peak
- Max SPL: 136dB
- Driver Size: 21″ Woofer with 4.5″ Voice Coil
- Frequency Response: 29Hz – (Upper Cutoff Not Specified)
- Inputs: 2 x XLR
- Outputs: 2 x XLR THRU
- DSP: SysCore® DSP with 6 Presets, PEQ, Cardioid Mode, Delay
- Mounting: 2 x M20 Thread Mounts
- Enclosure: Birch Plywood with Polyurea Coating
- Control: Free App (iOS & Android) with Full Remote Adjustment
- Dimensions (H x W x D): 700 x 610 x 750mm
- Weight: 47.4kg
