Studio sound. Live performance

StudioLive 18sAI Active Integration subwoofers deliver studio-monitor accuracy onstage with unprecedented onboard processing and networking features. PreSonus Active Integration technology enables wireless and wired networking control for setup, tuning, and monitoring functions, using an iPad, a Mac or Windows laptop, or both. Powerful and musical, the StudioLive 18sAI naturally extends low-frequencies with a fast and accurate transient response and is a perfect mate for StudioLive 312AI, 315AI, and 328AI full-range loudspeakers, making it an ideal choice for installations and mobile applications where fidelity matters.

Tight, clean, natural bass

Designed to complement full-range systems, without overshadowing them, the StudioLive 18sAI active subwoofer naturally extends the reach of your full-range systems’ low end to deliver studio monitor accuracy throughout its range. Driven by 1,000W RMS of Class D amplification, the 18sAI’s 18-inch ferrite speaker delivers exceptional low-end performance down to 35 Hz. The net result is a musical approach to sub-bass frequency reproduction that affords a natural listening experience on a large scale.

A four-way PA that works as one

Although the StudioLive 18sAI is flexible enough to work great with other powered loudspeakers, when used with a StudioLive 312AI, 315AI, or 328AI, the StudioLive 18sAI forms a true four-way system. For applications that require a more linear (“flat”) frequency response between the subwoofer and full-range speaker, engage the highpass filter on the full-range StudioLive AI-series loudspeaker to readjust the phase and time-alignment, keeping the full-range system in phase with the 18sAI subwoofer. Need a little more bump? Leave the highpass filter off and enjoy the perfectly phase- and time-aligned overlap at 100 Hz between your full-range system and your subwoofer.

You’re in control-here, there, and everywhere

The StudioLive 18sAI subwoofer features a robust onboard loudspeaker processor that can be accessed and controlled over a standard LAN network. PreSonus’ SL Room Control software makes customizing your speaker system as simple as connecting an Ethernet cable to a wireless router. Creating a cardioid subwoofer array is as easy a pressing two buttons, thanks to onboard polarity reverse and three alignment-delay presets.

Flexible connections and mounting capabilities

The rear of the StudioLive 18sAI reveals stereo line inputs (XLR/¼-inch combo) and full-range, switchable stereo/summed-mono line outputs (XLR). An optional, pull-tested Sub Pole lets you safely and securely mount a StudioLive AI full-range system atop the 18sAI. An optional, mountable, heavy duty Sub Dolly lets you roll your StudioLive 18sAI in and out with minimal stress, and the lightweight plywood enclosure includes ergonomic side handles.

Main Components

  • 18-inch ferrite transducer
  • 1,000 watt (bridged), Class D amplifier
  • Active Integration 32-bit, 96 kHz DSP with variable crossover, dynamic limiting, and excursion limiting
  • Stereo line inputs (XLR-¼” combo) and switchable stereo/summed-mono line outputs (XLR)
  • Universal Switch mode power supply with power-factor correction

Controls and Networking

  • Ships with Ethernet connection for wired control; optional Dante card
  • Alignment delay (switchable: 0, 2, or 4 feet) enables subwoofer to be placed in different positions relative to a full-range speaker system
  • Wireless or wired networking with free SL Room Control software for Mac, Windows, and iPad enables complete setup, tuning, and monitoring
  • Network Setup Wizard automatically detects each speaker and allows you to quickly connect to your wireless router network
  • Remote control over Maximum SPL/output level, high-pass filter, onboard operational modes, performance monitoring, mute, and speaker delay
  • 31-band graphic EQ and 8-band parametric EQ (total of 10, including feedback notch filter)
  • Visually display room layout on a laptop or iPad
  • ​Edit, save, recall, and share speaker-setup parameters

Convenience Features

  • Comfortable, ergonomic handles
  • Integrated pole insert and interlocking stacking provisions
  • Optional mountable Sub Dolly and pull-tested Sub Pole to mount a full-range system atop the 18sAI

Acoustic Performance

  • Configuration: Powered subwoofer, ported
  • Frequency Response (-10 dB): 29 Hz to 141 Hz
  • Frequency Response (-6 dB): 32 Hz to 110 Hz
  • Maximum Peak SPL: 135 dB

Transducer

  • LF Transducer: 18" Ferrite
  • Voice Coil Diameter: 4"

Amplifier

  • Type: Class D
  • Total Power Output: 1,000W (total power without protection algorithms and limiter enabled)
  • LF Power: 2 x 500W bridged
  • Rated THD: <0.05% (20 Hz - 20 kHz)
  • Dynamic Range: 119 dB (A-weighted)
  • Bandwidth: 20 Hz - 20 kHz
  • Cooling: Free air convection

Safety

  • Amplifier Protection: Over-current, DC, over/under-voltage, over-temperature, high frequency
  • Transducer Protection: 4-ch. multi-threat limiter

Power

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

DSP

  • Contour Presets: Normal, Extended LF
  • Polarity: Normal or Reverse
  • Delay Presets: 0m, 1m, 2m
  • Bit Depth: 24-bit
  • Sample Rate: 96 kHz

Enclosure

  • Material: Eucalyptus Plywood
  • Finish: Chemline polyurethane
  • Grille: Powder-coated steel
  • Dimensions (HxDxW): 23" x 24" x26"
  • (584.2 x 609.6 x 669.4 mm)
  • Unit Weight: 94 lbs (42.64 kg)
  • Handles: One on each side

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) - throughput
  • Controls: Speaker level (Variable: -12 dB to +12 dB), mono sum
  • Indicators: DSP Preset, Delay Preset, Polarity Invert, Network Connected, Network Activity, Wi-Fi Setup, Wi-Fi On, Signal, Limit, Clip, Thermal
  • MPN: 125191
  • UPC: 673454002076

Audio MIDI Plus is committed to deliver the best experience for our customers. If for some reason you are not satisfied with your purchase, you may return it for a refund of the purchase price, an exchange or a store credit within 30 days from the ship date. 

In the unlikely event that you received a defective product, a wrong product, or damaged product, Audio MIDI Plus will replace it at no charge of any additional shipping cost. We will send you a prepaid label to return the item, and ship you a replacement. You will not incur any shipping charges. Please notify us of any of damaged, defective or misshipped products within 14 days.

After 30 days, you may request manufacturer warranty if your item malfunctions. Unless otherwise specified, Audio MIDI Plus is an authorized dealer for all the brands we represent.

How to request a return:
Please email us or call us to obtain a RMA number. All returns must be in a re-sellable condition and include all packing materials, accessories and paperwork. We may apply a restocking fee if the returned products fall into these following categories:

  • Missing original packaging, manuals, accessories, or any contents that was included
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Please send all returns to:
Audio MIDI Plus Returns
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Carlsbad, CA 92010

The following items are not returnable, unless received DOA, in which we will send a replacement:

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