PreSonus ULT18 Active Sound-Reinforcement Subwoofer

Overview of PreSonus ULT18 Active Sound-Reinforcement Subwoofer

Designed to complement any full-range PA loudspeaker and a perfect companion for the PreSonus® ULT12 and ULT15, the ULT18 subwoofer delivers a powerful, clear, and accurate low-end punch. With 2,000 watts (peak) of Class D power and a direct radiating, ported enclosure, it has all the muscle needed for the detailed low-frequency performance audio pros demand. 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 and bring more thump.

To provide maximum versatility, the ULT18 offers several important user controls. Unlike most subwoofers in this class, the ULT18 features a variable lowpass filter that enables you to accurately dial in the crossover transition between the subwoofer and your full-range system. Two DSP presets provide extended low-frequency performance or a more natural response to suit a variety of applications, and of course you get polarity reverse. A Mono Mode function is also provided to simplify cabling multiple mono subs in a stereo system.

Like the full-range ULT12 and ULT15 loudspeakers, the ULT18 has a rugged, tour-grade birch enclosure for the distinctive performance characteristics that only wood can offer. A locking IEC power connector, M10 rigging points, integrated castor provisions, and ground-stacking provisions, making it a great choice for a wide variety of mobile and install applications. Two combo XLR and ¼” TRS line-level inputs with level control and throughputs are provided to connect full-range systems or multiple subwoofers in larger systems. As with the ULT12 and ULT15, you can defeat the front power-indicator LED for low-visibility installs.

Features:

• 18-inch custom woofer with 4-inch voice coil
• 7 mm driver travel before over-excursion
• 2,000W Class D power (2 × 500 W continuous)
• Stereo combo XLR and ¼” inputs with direct outputs
• Onboard fully variable lowpass filter lets you dial in upper frequency limit
• Controls: Output Level, Lowpass Filter, Preset Select, Polarity Invert On/Off, Mono On/Off, Front LED On/Off
• Defeatable front-panel LED
• Rugged, texture-painted eucalyptus plywood enclosures
• Tour-grade 16 gauge steel grille
• Comfortable ergonomic handles
• Ground Stacking provisions
• Integrated castor provisions (castor kit sold separately)
• Locking IEC connection

Specifications:

• Acoustic Performance:
  • Configuration: Powered subwoofer, ported
  • Frequency Response (-3 dB): 42 Hz – 150 Hz (Variable)
  • Maximum Peak SPL: 135 dB
  • Crossover Frequency: 90 Hz
  • Low Pass Filter Range: 50 Hz - 150 Hz
• Transducer:
  • LF Transducer: 1x18" Ferrite
  • Voice Coil Diameter: 4"
• Amplifier:
  • 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
• DSP:
  • Presets: Extended LF
  • Polarity: Normal or Reverse
  • Bit Depth: 24-bit
  • Sample Rate: 96 kHz
• Enclosure:
  • 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)
• Safety:
  • Amplifier Protection: Over-current, DC, over/under-voltage, over-temperature, high frequency
  • Transducer Protection: limiter
• Power:
  • 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