LD Systems DDQ SUB 18 active PA Subwoofer with DSP



The LD Systems DDQ Sub 18 is a powerful active subwoofer with digital signal processing for demanding PA applications. It is precisely adapted for combination with the full-range speakers of the DDQ Series and is equally suitable for use with tops made by other manufacturers.

The compact bass-reflex design is loaded with an 18″ FaitalPRO bass speaker that has a 4″ voice coil and a neodymium magnet driven by two 700-watt Hypex Class D power amplifier modules with a highly efficient switching power supply with a total output of 1400 watts RMS. The DDQ Sub 18 attains a maximum sound-level pressure of 134 dB with a frequency response curve of 30 – 120 Hz.

The Sharc DSP programmed especially for the DDQ subwoofers ensures distortion-free and reliable operation even at maximum volume levels with a 1ms look ahead limiter, frequency and phase correction, as well as all protection circuits, and has a large dynamic range of 127dB/113 dB (ADC/DAC). Seven DSP Presets permit selectable crossover frequencies between 80 and 120Hz. Eight additional presets make it possible to realize cardioid configurations of 2 or 3 subwoofers, whereby it is possible to attain rear attenuation of up to 20dB. In addition to XLR inputs and outputs, the DDQ Sub 18 has a separate mono output with a 100Hz high-pass filter. Additional features are LED function indicators and a ground lift switch; the volume and preset controls can be deactivated to prevent inadvertent adjustment.

The cabinet of the DDQ Sub 18 is made of 18mm thick multiplex with an extremely durable polyurethane finish. It is equipped with two M20 threaded flanges and ergonomic handles and is prepared for mounting of casters.



Product type
PA subwoofer


DSP controlled

Low/mid driver dimensions
18 “

Woofer size
457.2 mm

Woofer magnet

Woofer brand
Faital Pro

Woofer voice coil
4 “

Woofer voice coil (mm)
101.6 mm

Class D

1400 (2 x 700) W

Frequency response
30 – 120 Hz

Max. SPL (continuous)
126 dB

Max. SPL (peak)
134 dB

Protection circuits
DSP-based “look ahead” limiter , over-current , RMS power supply limiter , RMS speaker limiter , short circuit

DSP presets , DSP/ Gain enable , Gain , ground lift , Power

DSP/ Gain disable , Operate , Peak Limit , Signal

Line inputs

Line input connectors

Line outputs
3 (2x Input Link, 1x Sat Out with 100Hz high-pass)

Line output connectors

Operating voltage
Switching power supply

Operating voltage
180 – 264 V ~ / 47 – 63 Hz

Cabinet material
18 mm Plywood

Cabinet surface

Cabinet construction

510 mm

700 mm

725 mm

44,5 kg

15 x DSP presets with 4 selectable cardioid setups and 7 selectable crossover frequencies (80-120Hz) , 2 x threaded flange (M20) , 3 x corner handles , prepared for mounting of casters


LD systems

The same passion that takes hold of a musician on stage is what the engineers and designers at LD Systems® place into our products. These are not only sound technology specialists, but also sound technology enthusiasts, who passionately work out every detail until the sound and design meet the highest of standards.


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