(631) 752-9824

425 Oser Ave, Unit 3B
Hauppauge, NY 11788


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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 d?cor. 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
  • 140? x 124? 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

Transducer:  LF 1x 4-in cone; HF 1x 1-in. dome

Loading:  LF: Sealed

Amplifier Channels: Single-amp LF/HF

External Signal Processing: High Pass Filter

PERFORMANCEOperating Range (-10 dB, Hz)

Full Range: 90 22k

Axial Sensitivity (1W @ 1m, dB SPL)

Full Range: 90

Power Handling/Impedance (Watts @ Ohms)

Full Range: 30 @ 16

Calculated Maximum Output Peak (dB SPL)

Full Range: 108

Calculated Maximum Output Long Term (dB SPL)

Full Range: 102

Transformer Taps (Watts)

70v: 3.75, 7.5, 15, 30
100v: 7.5, 15, 30

Nominal Coverage (degrees)

Horizontal: 140
Vertical: 124

CIS300 White 0009668-00
AccessoriesPart Number
Pre-installation bracket

Dimensions (inches/millimeters)

Height: 5.7/144
Diameter: 8.7/221

Weights (pounds/kilograms)

Net: 6.2/2.8


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