Low-end punch you can hear and feel.

Designed to complement any full-range PA loudspeaker, and a perfect companion for the PreSonus® full-range boxes, the ULT18 subwoofer delivers a powerful, clear low-end punch.

With 135 dB output from 2,000 watts of Class D power and a direct radiating, ported enclosure, it has all the muscle needed for detailed low-frequency performance in a wide range of applications. Its custom, 18-inch, low-frequency transducer with 4-inch voice coil provides 7 mm of driver travel before over-excursion to push more air faster. Over-current, DC, over/under-voltage, over-temperature, and high-frequency protection ensure reliability.

Equally at home in mobile and installed systems.

The ULT18 has two combo mic/line inputs and a Direct Output with level control. DSP presets provide extended low-frequency performance or a more natural response to suit a variety of applications. Other features include a variable lowpass filter, polarity invert with indicator, mono on/off with indicator, and front-panel LED on/off with indicator. Indicators are also provided for Preset, Signal, Clip, and Thermal.

This quality subwoofer features a eucalyptus plywood enclosure with tough Chemline™ polyurethane coating, power-coated steel grille, 12 M10 mounting points, and ground-stacking capabilities.

Key features:

  • 18-inch custom woofer with 4-inch voice coil
  • 2,000W Class D power
  • 2 combo XLR/¼” TRS inputs
  • Variable Low Pass control
  • Direct Output
  • Extended LF DSP mode preset with LED indicator
  • Polarity Invert On/Off, Mono On/Off, Front LED On/Off, Signal, Clip, Thermal LEDs
  • Locking IEC connection
  • Rugged, texture-painted eucalyptus plywood enclosure
  • Tour-grade 16 gauge steel grille
  • Comfortable ergonomic handles
  • 12 integrated M10 rigging points for suspended horizontal and vertical installation



Technical Specifications

Acoustic Performance

Configuration Powered subwoofer, ported
Frequency Response (-3 dB) 45 Hz – 250 Hz
Maximum Peak SPL 135 dB
Crossover Frequency 90 Hz


LF Transducer 1x18" Ferrite
Voice Coil Diameter 4"


Type Class D
Total Power Output 2,000W Peak (1,000 RMS)
LF Power 2 x 500W bridged (1000W total)
Cooling Free air convection
Rated THD <0.05% (20 Hz - 20 kHz)
Dynamic Range 119 dB (A-weighted)
Bandwidth 20 Hz - 20 kHz

Connections and Controls

Input Channels 2 line
Input Connector Types 2 combo
Line Input Impedance 10 kΩ
Maximum Input +22 dBu
Output Connector 2 XLR (M): Mix out, Direct out
Controls Output Level
Low Pass Filter
Preset Select
Polarity Invert On/Off
Mono On/Off
Front LED On/Off
Indicators DSP Preset, Polarity Invert On/Off, Mono On/Off, Front LED On/Off, Signal, Clip, Thermal


Presets Extended LF
Polarity Normal or Reverse
Bit Depth 24-bit
Sample Rate 96 kHz


Material Eucalyptus Plywood
Finish Chemline™ polyurethane
Grille Powder-coated steel
Dimensions (HxWxD) 22.5” x 25” x 24.5” (572 mm x 635 mm x 622 mm)
Unit Weight 95 lbs. (43 kg)
Handles 2 (One on each side)


Amplifier Protection Over-current, DC, over/under-voltage, over-temperature, high frequency
Transducer Protection limiter


AC Power Input 100-230V~, 50-60 Hz
AC Power Consumption (1/8 Power) 150W

Suspension Mounting

Rigging Points 12 M10
Mounting Ground stack provisions

As a commitment to constant improvement, PreSonus® Audio Electronics, Inc., reserves the right to change any specification stated herein, at any time, without notification.