Presonus StudioLive 18sAIA four-way PA system that works as one.
When used with a StudioLive 312AI, 315AI, or 328AI, the StudioLive 18sAI subwoofer forms a true four-way system. But the StudioLive 18sAI is flexible enough to work great with other powered loudspeakers, too!
StudioLive AI-series loudspeakers avoid this problem when combined with an 18sAI subwoofer. For applications where a frequency overlap at 100 Hz is beneficial, you can achieve bigger bass sound without any extra effort. 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.
Let’s say you normally mount your full-range PA speakers directly atop your subwoofer using the custom-designed SP1BK sub pole. Whether with a StudioLive AI speaker or Brand X, with this configuration, your full-range system and subwoofer should be time-aligned for practical purposes, so you can leave the StudioLive 18sAI’s alignment setting at 0M (no delay).
But what if your sub can’t be set up directly beneath your full-range StudioLive loudspeaker? If the same low frequencies are reproduced by two sound sources that are set some distance apart, you’ll have problems with cancellation and reinforcement. Low frequencies in the crossover region between full-range and subwoofer have wavelengths that are several feet long (the wavelength of a 150 Hz wave is about 7.5 ft!), and reinforcement and cancellation will occur as the waves interact in the room.
The StudioLive 18sAI’s alignment-delay presets provide compensation for this effect. For instance, if your full-range speaker is on a tripod stand adjacent to your subwoofer, the two speakers are typically about one meter apart. Choosing the 1M setting will delay the signal to the subwoofer’s onboard amp by about 2.9 ms, which compensates for that 1 meter offset.
If your full-range system is on stage, and the subwoofer is on the floor, assuming a typical stage, the two will probably be about two meters apart. The 2M setting adds about 5.9 ms of delay the signal going to the subwoofer amp, which compensates for a 2 meter offset.
In this way, you can keep your subwoofer in alignment with your full-range system for the most common speaker configurations without any extra gear. You’ll experience tighter bass response and a more cohesive sound, which means better intelligibility and bigger sound without more volume.
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
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