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Presonus StudioLive 18SAI Active 18" Subwoofer


  • Our Price
  • $1,399.95
  • Regular price MSRP: $1,599.95





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Get A Flexible Full Range System With The Presonus StudioLive 18SAI Active 18-" Subwoofer

When used with a Presonus StudioLive 312AI, 315AI, or 328AI, the Presonus StudioLive 18sAI subwoofer forms a true four-way system. But the Presonus StudioLive 18sAI is flexible enough to work great with other powered loudspeakers, too!

With most 4-way systems, leaving frequency content below 100 Hz in the full-range loudspeaker can introduce cancellation and reinforcement with the highest frequencies that are reproduced by theËÇ£“-u0014ËÇÖ“íPreSonusËÇ£“-u0014ËÇÖ“ísubwoofer. Some frequencies will be exaggerated (reinforced) while others are weakened (cancellation).

PreSonusËÇ£“-u0014ËÇÖ“íStudioLive AI 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 (ËÇ£“‚“ï“-u0014’ŒËÇó“„flatËÇ£“‚“ï“-u0014’ŒËÇÖ’Ñ) frequency response between the subwoofer and full-range speaker, simply engage the highpass filter on the full-rangeËÇ£“-u0014ËÇÖ“íPreSonusËÇ£“-u0014ËÇÖ“íStudioLive AI 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.

LetËÇ£“‚“ï“-u0014’Œ“ï“ñ“‚s say you normally mount your full-range PA speakers directly atop your subwoofer using the custom-designed SP1BK sub pole. Whether with aËÇ£“-u0014ËÇÖ“íPreSonusËÇ£“-u0014ËÇÖ“íStudioLive 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 theËÇ£“-u0014ËÇÖ“íPreSonusËÇ£“-u0014ËÇÖ“íStudioLive 18sAIËÇ£“‚“ï“-u0014’Œ“ï“ñ“‚s alignment setting at 0M (no delay).

But what if your sub canËÇ£“‚“ï“-u0014’Œ“ï“ñ“‚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, youËÇ£“‚“ï“-u0014’Œ“ï“ñ“‚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.

TheËÇ£“-u0014ËÇÖ“íPreSonusËÇ£“-u0014ËÇÖ“íStudioLive 18sAIËÇ£“‚“ï“-u0014’Œ“ï“ñ“‚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 subwooferËÇ£“‚“ï“-u0014’Œ“ï“ñ“‚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. YouËÇ£“‚“ï“-u0014’Œ“ï“ñ“‚ll experience tighter bass response and a more cohesive sound, which means better intelligibility and bigger sound without more volume.

  • 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
  • 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 (1000W total)
  • Rated THD: <0.05% (20 Hz - 20 kHz)
  • Dynamic Range: 119 dB (A-weighted)
  • Bandwidth: 20 Hz - 20 kHz
  • Cooling: Free air convection
  • Input Channels: 2 line
  • Input Connector Types: 2 combo
  • Line Input Impedance: 10 kËÇ£“äËÇÖ-u0014
  • Maximum Input: +22 dBu
  • Output Connector: 2 XLR (M) - throughput
  • Amplifier Protection: Over-current, DC, over/under-voltage, over-temperature, high frequency
  • Transducer Protection: 4-ch. multi-threat limiter
  • AC Power Input: 100-230V~, 50-60 Hz
  • AC Power Consumption (1/8 Power): 150W

Manufacturer: Presonus Audio
Model: STUDIOLIVE 18SAI
Warranty: See manufacturer website for details
SKU: I322064-1