The CIS400 is a complete two-way bass-reflex flush-mount loudspeaker assembly designed for fixed installations into typical ceiling plenum spaces. Employing a unique HF waveguide design based on leading brand studio monitors, the CIS400 delivers superior dispersion and pattern control over conventional coaxial designs. The waveguide integrates the HF driver with a 6.5″ LF driver optimized for smooth frequency response and seamless transition through the crossover point. The result is extraordinary acoustic performance not generally associated with a commercial ceiling speaker in this price range.

Core Technologies
Design + Build

Product Description

The CIS400 is supplied fully assembled, complete with a sealed zinc-coated steel backcan and cam-style installation clamps. The metal enclosure includes a recessed Euroblock input connector with detachable mating plug, concealed behind a hinged metal cover plate. A welded tab is provided for seismic restraint. Two steel T-Bar support channels are provided to facilitate installation to a standard tile ceiling. Also supplied is a steel split C-ring, which serves to disperse the clamping pressure of the mounting cams.

The CIS400 is supplied with an integral 70/100V line transformer rated to a maximum of 30 watts. Power is adjustable by means of a recessed rotary switch on the front bezel, and allows selection of 30, 15, 7.5 and 3.7 watt taps. A second recessed rotary switch is provided to engage a 16-Ohm tap for use with low-impedance amplifiers, or a 150 Hz high-pass filter.

The speaker assembly is shipped with a detachable plastic cover fitted over the transducers inside the bezel. This protective cover protects the drivers from damage during installation and also serves as a paint cover, allowing convenient spray painting to match interior décor. A powder-coated perforated steel grille is supplied, and easily installed once the desired Tap Selector and Full-Range/High-Pass switches have been set.

The entire assembly is fully tested at the time of manufacture and is warranted to be free from defects in materials and workmanship for a period of five years from the date of purchase. The speaker is designed for use in ceiling plenum spaces and meets UL 1480 and UL 2043 regulations governing signaling devices and plenum applications.

  • 6.5 inch cast steel basket, high-efficiency carbon fiber woofer
  • 110º x 110º constant directivity horn with Ferrofluid® cooled, 1″ Neodymium dome  tweeter
  • Built-in LICC low-inductance passive crossover with high frequency dynamic protection
  • Lightweight, UV/weather resistant, high density polystyrene
  • Integrated mounting system and hardware included UL/cUL/CE listed
The Details Matter


Frequency Response
Full Range: 70 – 22k
Operating Mode

Transformer Taps:
70V: 5w, 10w, 20w, 40w
100V: 10w, 20w, 40w

Front-mounted Rotary Switch:
Full Range (70/100 Volt Systems)
High Pass (70/100 Volt Systems)
Full Range (16 ohm, Low-Impedance Systems)

Front-mounted Rotary Switch:
Secondary Tap Positions


LF 1x 6.5-in cone
HF 1x 1-in. dome

Nominal Beamwidth
Horizontal: 110
Vertical: 110
Power Handling

Full Range: 30W @ 16ohms


Removable locking connector with screw-down terminals.
Two input terminals and two loop-thru output terminals.


(Diameter x Height): 11.8 in/300 mm x 6.6 in/168 mm
Front of Ceiling Tile to Back of Can: 5.6 in/142 mm
Cutout Size: 10.8 in/274 mm


7.9 lb (3.6 kg)

Docs / Drawings / Tools


Training / Instruction


Add-on Options


Pre-installation bracket: (2PER) 0018647

Find the Right Speaker

Series Range



LF 1x 4-in cone
HF 1x 1-in. dome

Nominal Beamwidth

Horizontal: 140
Vertical: 124


Full Range: 90 – 22k


102 dB
EAW: Eastern Acoustic Works

This website stores cookies on your computer. These cookies are used to collect information about how you interact with our website and allow us to remember you. We use this information in order to improve and customize your browsing experience and for analytics and metrics about our visitors both on this website and other media. To find out more about the cookies we use, see our Privacy Policy.

If you decline, your information won’t be tracked when you visit this website. A single cookie will be used in your browser to remember your preference not to be tracked.