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product arrow Extron SI28 sub woofer speaker


The Extron SI 28 two-way surface mount speaker features a ferrofluid-cooled, aluminum dome tweeter coupled to an Extron exclusive conical horn design for minimum phase shift and a flat response over the mid- and high-frequency ranges. Harsh tonal qualities due to cancellation in portions of the frequency range caused by phase shifting are all but eliminated with this new conical horn design. A long-throw woofer with large magnets provides solid low-frequency response. A new approach to crossover design assures a smooth transition from bass through midrange to the high frequencies, delivering optimum voice and music reproduction. An input power-limiting protection circuit is included for preventing woofer and tweeter damage due to overdriving.

This System INTEGRATOR® Series speaker is ideally suited for classrooms, conference rooms, and boardrooms, and with a weather-resistant construction, is at home in outdoor environments.

The SI 28 features an 8" (20.3 cm) long-throw woofer, a 1" (2.5 cm) tweeter, 90 watts continuous pink noise and 180 watts continuous program capacity, and frequency response from 50 Hz to 20 kHz. This speaker has a nominal impedance of 8 ohms with a durable, high-impact housing.

Included with the SI 28 is Extron's exclusive Patented V-Lock® mounting hardware, which facilitates easy, secure installations and allows for wide 60° horizontal and 55° vertical travel as well as 360° rotation. This flexible design allows the speakers to be placed vertically or horizontally to meet a variety of placement needs.

The SI 28 is sold in pairs and is available in a black or white finish, and includes a 5 year parts and labor warranty.


  • Exclusive conical horn design
  • 8 ohm nominal impedance
  • 1" (2.5 cm) ferrofluid-cooled, aluminum dome tweeter
  • 8" (20.3 cm) long-throw woofer with dual tuned bass reflex ports
  • Frequency response: 50 Hz to 20 kHz
  • 90 watts continuous pink noise, 180 watts continuous program
  • Exclusive V-Lock® mounting system included, provides horizontal and vertical speaker mounting
  • Internal driver overload protection
  • Black or white high-impact, weather-resistant enclosure
  • Grille and enclosure may be painted to match environment
  • Dimensions: 16.5" H x 11.5" W x 8.6" D (41.9 cm H x 29.2 cm W x 21.9 cm D)