0 items in your cart
This website uses cookies to help improve your online experience. If you continue without changing your cookie settings we'll assume that you are happy for this website to use cookies. Find out more about our cookies. Hide this message.

PreSonus StudioLive 18sAI Active Integration Subwoofer

Manufacturer PreSonus

Request more information or contact us now for purchasing information.


With the StudioLive™ 18sAI active PA subwoofer, you can get pretty darned low—down to 35 Hz (-6 dB). Better yet, the 18sAI’s 18-inch ferrite speaker delivers those lows with an accuracy usually found only in studio monitors—except a whole lot louder (up to 135 dB SPL), thanks to a 1,000 watt (bridged), Class D power amplifier. It adds up to punchy, round-sounding lows that make kick drums, basses, and other basement-dwelling sounds come alive. But that’s just the start!

All three full-range loudspeakers are phase- and time-aligned to create a true four-way system when paired with a StudioLive 18sAI subwoofer. For applications that require a more linear (“flat”) frequency response between the subwoofer and full-range speaker, simply engage the highpass filter on the full-range StudioLive AI-series loudspeaker. This will also readjust the phase and time-alignment to keep the full-range system in phase with the 18sAI subwoofer, enabling you to create the best four-way system for your application. 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. This is especially useful for applications that require more kick from their kick drum.

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



Computer system requirements:
Below are the minimum computer-system requirements for SL Room Control:
Mac® OS X 10.8 or 10.9 (32- or 64-bit)
Intel® CoreTM 2 Duo, 2 GHz
4 GB RAM (more recommended)
Windows® 7 SP1 or Windows 8 (32- or 64-bit)
Intel® CoreTM 2 Duo, 2 GHz
4 GB RAM (more recommended)
​Mac and Windows Systems
Ethernet port or wireless connection required
Wireless router required
Monitor with at least 1280x768 resolution

Apple iPad
iPad 2
​iOS 7.0.1 or higher

Acoustic Performance
Configuration 312AI: 3-way triamped
315AI: 3-way triamped
328AI: 3-way quad-amped
328i-W/B: 3-way quad-amped Powered subwoofer, ported
Frequency Response (-10 dB) 312AI: 50 Hz to 23 kHz
315AI: 46 Hz to 23 kHz
328AI: 54 Hz to 23 kHz
328i-W/B: 54 Hz to 23 kHz 29 Hz to 141 Hz
Frequency Response (-6 dB) 312AI: 56 Hz to 22 kHz
315AI: 52 Hz to 22 kHz
328AI: 59 Hz to 22 kHz
328i-W/B: 59 Hz to 22 kHz 32 Hz to 110 Hz
Nominal Coverage (-6 dB) 90° x 60° -
Maximum Peak SPL 312AI: 131 dB
315AI: 131 dB
328AI: 133 dB
328i-W/B: 133 dB 135 dB
Crossover Frequency LF: 100 Hz to 1 kHz (overlapped)
HF (312AI and 315AI): 1.8 kHz
HF (328AI and 328i-W/B): 1.7 kHz -
Directivity Index (DI) 312AI: 10 dB, >460 Hz
315AI: 10 dB, >500 Hz
328AI: 10 dB, >420 Hz
328i-W/B: 10 dB, >420 Hz -
Directivity Factor (Q) 312AI: 10.0, >460 Hz
315AI: 10.0, >500 Hz
328AI: 10.0, >420 Hz
328i-W/B: 10.0, >420 Hz -
LF Transducer 312AI: 1x12" Ferrite;
315AI: 1x15" Ferrite;
328AI: 2x8" Ferrite
328i-W/H: 2x8" Ferrite
18" Ferrite
MF Transducer 8" CoActualTM -
HF Transducer 1.75" compression driver -
Voice Coil Diameter - 4"
Type Class D Class D
Total Power Output 2,000W (total power without protection algorithms and limiter enabled)
1,000W (total power without protection algorithms and limiter enabled)
LF Power 312AI: 2 x 500W bridged (1000W total)
315AI: 2 x 500W bridged (1000W total)
328AI: 2 x 500W
328i-W/B: 2 x 500W 2 x 500W bridged (1000W total)
MF Power 500W -
HF Power 500W -
Rated THD <0.05% (20 Hz - 20 kHz)
<0.05% (20 Hz - 20 kHz)
Dynamic Range 119 dB (A-weighted) 119 dB (A-weighted)
Bandwidth 20 Hz - 20 kHz 20 Hz - 20 kHz
Cooling Free air convection
Free air convection
Connections and Controls
Input Channels 1 mic, 1 line 2 line
Input Connector Types 1 XLR (F), 1 combo 2 combo
Phantom Power 15 VDC (Mic Input only) -
Mic Input Impedance 1 kΩ -
Line Input Impedance 10 kΩ
10 kΩ
Maximum Input +22 dBu +22 dBu
Output Connector 1 XLR (M) - Mix out 2 XLR (M) - throughput
Controls Mic Level (Variable: Off to +48 dB),
Line Attenuation (Variable: -24 dB to 0 dB),
Speaker Attenuation (Variable: -24 dB to 0 dB) Speaker level (Variable: -12 dB to +12 dB), mono sum
DSP Preset, HPF On/Off, Network Connected, Network Activity, Wi-Fi Setup, Wi-Fi On, Signal, Limit, Clip, Thermal
DSP Preset, Delay Preset, Polarity Invert, Network Connected, Network Activity, Wi-Fi Setup, Wi-Fi On, Signal, Limit, Clip, Thermal
Contour Presets Normal, LBR Source, Floor Monitor Normal, Extended LF
Polarity - Normal or Reverse
Delay Presets - 0m, 1m, 2m
HPF 100 Hz, 4th-order Linkwitz-Riley
Bit Depth 24-bit 24-bit
Sample Rate 96 kHz 96 kHz
Material 15 mm Baltic birch 15 mm Baltic birch
Finish ChemlineTM polyurethane ChemlineTM polyurethane
Grille Powder-coated steel Powder-coated steel
Dimensions (HxDxW) 312AI: 24.8" x 19.5" x 16.4"
(629.92 mm x 495.3 mm x 416.56 mm);
315AI: 27.9" x 18.6" x 21.3"
(708.66 x 472.44 x 541 mm);
328AI: 30.1" x 15.7" x 13.3"
(764.54 x 398.78 x 337.82 mm) 23" x 24" x26"
(584.2 x 609.6 x 669.4 mm)
Unit Weight 312AI: 62 lbs (28.12 kg)
315AI: 71 lbs (32.2 kg)
328AI: 51 lbs (23.13 kg) 94 lbs (42.64 kg)
Handles One on each side (Not available on 328i-W/B)
One on each side
Monitor Angle 50° -
Amplifier Protection Over-current, DC, over/under-voltage, over-temperature, high frequency Over-current, DC, over/under-voltage, over-temperature, high frequency
Transducer Protection 4-ch. multi-threat limiter 4-ch. multi-threat limiter
AC Power Input 100-230V~, 50-60 Hz 100-230V~, 50-60 Hz
AC Power Consumption (1/8 Power) 250W 150W
Suspension Mounting
Rigging Points 12 M10 (16 on 328i-W/B) -
Mounting 35 mm, 2-position (315AI: single-position; 328i-W/328i-B: no pole mount)


Equipment available to buy from this site is for professional use only. Please note in certain countries some products listed may not be available from A.C. Entertainment Technologies Ltd.

E&OE. Information is subject to change without notice. The rights and ownership of all trademarks are recognised.


No downloads

No related products

No accessories

A.C. Audio Online Shop