The CIS Series contains a range of ceiling-mounted, two-way loudspeaker systems engineered for high-end commercial integration.

Core Technologies
Design + Build

Product Description

The CIS300 is a compact two-way flush-mount loudspeaker assembly designed for fixed installations into typical ceiling plenum spaces. Employing a modified HF waveguide originally developed for use in studio monitors, the CIS300 delivers superior dispersion and pattern control over conventional coaxial designs. The waveguide integrates the HF driver with a 4″ LF driver optimized for smooth frequency response and seamless transition through the crossover point. The result is acoustic performance not generally associated with a commercial ceiling speaker of this size or in this price range.

The CIS300 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 CIS300 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 paper 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.

  • High-efficiency 4″ polypropylene woofer
  • 140º x 124º constant directivity horn with 1″ cloth dome tweeter
  • Built-in LICC low-inductance passive crossover with high frequency dynamic protection
  • Lightweight, UV/weather resistant, high density polystyrene, flush-mounting enclosure for multiple applications and minimum visual intrusion
  • Integrated mounting system and hardware included
  • UL/cUL/CE listed
The Details Matter


Frequency Response
Full Range: 90 – 22k
102 dB
Operating Mode

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

Control Features:

Front-mounted Rotary Switch:
Full Range (70/100 Volt Systems)
High Pass @ 150 Hz (70/100 Volt Systems)
16Ω (low-impedance operation)

Front-mounted Rotary Switch:
Secondary Tap Positions


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

Nominal Beamwidth
Horizontal: 140
Vertical: 124
Power Handling

Full Range: 30w @ 16ohms


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


(Diameter x Height): 8.7 in/221 mm x 5.7 in/144 mm
Front of Ceiling Tile to Back of Can: 4.6 in/116 mm
Cutout Size: 7.8 in/199 mm


6.2 lb (2.8 kg)

Docs / Drawings / Tools


Training / Instruction


Add-on Options


Pre-installation bracket: (2 PER) 0018646

Find the Right Speaker

Series Range



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

Nominal Beamwidth

Horizontal: 110
Vertical: 110


Full Range: 70 – 22k


EAW: Eastern Acoustic Works

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