is-18 & is-18a High Output Installation Subwoofers

is-18-right-IMG_8135is-18 and is-18a Features

  • 18 transducer with rubber surround and 4 (100 mm)
  • voice coil
  • 600 W/1200 W, long term/program power handling (IS-18)
  • 600 W continuous power (IS-18a)
  • Usable response down to 35 Hz
  • Max long term output 131 dB
  • High-density wood enclosure with durable textured finish


  • Ideal companion for i-Class full-range systems
  • Restaurants and cafes
  • Bars and clubs
  • Corporate facilities
  • House of worship
  • Retail outlets
  • Airports

i-Class systems are designed for AV contractors seeking a high-performance alternative to plastic box loudspeakers. By combining professional-grade components and rugged wood enclosures, i-Class models deliver sonic performance that far exceeds their competition.

For systems requiring greater LF extension, the is-18 and is-18a vented subwoofers are the perfect companions for the i-Class full-range models. Both subwoofers combine precision, low-pass crossovers with a professional-grade driver that incorporates a large, 4-inch voice coil for increased power handling and decreased power compression. Optimally tuned ports work in concert with the direct radiating driver to achieve a perfect balance of impact and definition.

The is-18a’s onboard class A/B amplification produces 600 watts continuous power output. A variable, 18 dB per Octave high-pass output allows easy satellite integration, while a phase switch ensures perfect LF alignment and staging. Large heat-sinks and efficient amplifier design eliminate the need for noisy cooling fans.

Both models feature robust, multi-ply wood enclosures with a rugged industrial-grade coating. The cabinet front features a protective steel grill with a water resistant powder coating.



DESCRIPTION Passive Single 18-in Subwoofer Powered Single 18-in Subwoofer
Frequency Response (+- 3 dB) 35 – 250 Hz 34 – 200 Hz
Frequency Range (-10 dB) 29-300 Hz 32 – 230 Hz
Sensitivity (1 W/1 m) 98 dB 98 dB
Power Handling Long Term(Continuous Power Output for powered Versions) 500 watts 600 watts
Power Handling Program 1200 watts N/A
Max Peak SPL(band limited pink noise 6 dB crest factor) 131 dB SPL 128 dB SPL
Max SPL Long Term (AVG SPL @1 band limited pink noise 6 dB crest factor)) 125 dB SPL 125 dB SPL
Coverage Horizontal 360 degrees – 6 dB 360 degrees – 6 dB
Coverage Vertical 360 degrees – 6 dB 360 degrees – 6 dB
LF Driver Description 18”, paper cone, cloth surround, 4” (100 mm) voice coil, ferrite, 19 mm winding, 10mm gap height,
Impedance 8 Ohms N/A
Connectors NL4 XLR/1/4in Combojack
Cabinet Material Multi-ply wood
Cabinet Surface Black polyurethane coating
Dimensions (H x W x D) 27.36 x 23.43 x 25.59 in (695 x 595 x 650 mm)
Weight Net: 97 lbs / 44 kgt Net: 108 lbs / 49 kg