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. It's custom 18-inch low-frequency transducer with a 4-inch voice coil provides 7 mm of driver travel before over-excursion to push more air and bring more thump.

Features:

• 18” Woofer with 4” Voice Coil 
• 7mm driver travel before over-excursion 
• Extended Bass preset 
• Polarity Invert 
• Onboard fully Variable Low Pass filter lets you dial in the upper-frequency limit 
• Maximum SPL 135 dB peak 
• 35 Hz to 150 Hz (variable) frequency response 
• 2000-watt Class D power (2 × 500W continuous) 
• Stereo Combo XLR and 1⁄4” inputs with direct outputs 
• Mono Mode sums both inputs to both outputs 
• Defeatable front-panel LED 
• Rugged, texture-painted eucalyptus enclosures 
• Tour-grade 16 gauge steel grilles 
• Comfortable ergonomic handles 
• Locking IEC connection 

Specifications:

• Type: Active 2-Way
• Driver: 18”(4”Voice Coil)
• Amplifier Type: Class D 
• Frequency Range: 42 Hz – 250 kHz Variable (+/- 3 dB) 
• Crossover Frequency: 90 Hz
• Maximum SPL: 135 dB
• Inputs: Two - Line (combo)
• Outputs: Twp - Line (XLR)
• User Controls: Output Level, Variable Low Pass Filter, Preset Select, Polarity On/Off, LED On/Off 
• Enclosure: 18 mm birch 
• Mounting: 12 M10, 4 Ground Stack Provisions
• Includes: One - PreSonus ULT18 Active Subwoofer, Locking IEC Power Cord
• Dimensions: 24.5" (W) x 25” (D) x 22.5” (H)
• Weight: 43 kg