Engineered for applications with limited plenum space incorporating a SoundTube-specific shallow backcan with an installed depth of only 3.5 inches. One 4 inch (102 mm) treated fiber woofer with cloth surround and one 0.75 inch (19 mm) silk dome tweeter. Easy-access six-position tap switch for 25/70.7/100-volt and 16 ohm transformer bypass position allows for easy ordering, stocking and installation. Reduced amplification costs with maximum efficiency including 87.5 dB sensitivity and 16 ohm impedance. Superior voice intelligibility with an average coverage angle of 100 (210 kHz, independently verified). Cost-effective 16 ohm settings allows for the use of multiples of two, four, or six speakers in a system using a standard amplifier without a transformer.


 Incorporates a painted steel grille for lasting durability. Ceramic input terminal accepts up to 10 gauge plenum rated signal wire and includes thermal fuse. Suitable for use in voice alarm applications subject to EU regulations EN60849 and BS5839-8. EN54-24 listed. Clamping allowance from 0.00 in. (0.0 mm) to 1.50 in. (38.1 mm). UL 1480 (UEAY) and 2043, CE (EMC Directive 89/366/EEC, EN55020, EN55013) approved.

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Manufacturer’s Suggested Retail Price$120.00
Manufacturer’s CategoryCM-EZ Economical In-Ceilings
Shipping Weight5 lbs / 2.27 kg
Carton Height5.5 in / 139.7 mm
Carton Length9 in / 228.6 mm
Carton Width9 in / 228.6 mm
CertificationsCE, EN54, RoHS, UL1480A, UL2043
Enclosure PropertiesABS, Sealed, Steel
Enclosure Volume100 cu in / 1638.71 cu cm
Included AccessoriesConduit Clamp, Cover Plate, Grille, Paint Mask
Optional AccessoriesWhite Grill (GRL-CM42-II-WH)|Tile Bridge (AC-CMEZ42-TB)|Pre-Construction Bracket (AC-CMEZ4-PCB)|Paint Mask (AC-CM-PM4EZ)|Junction Box (AC-CM-EZ-JBOX)
Source Inputs4 Pin Ceramic Terminal
Backcan Diameter5.78 in / 146.8 mm
Backcan Height3.75 in / 95.3 mm
Coverage Angle (-6dB @ 2kHz)95°
Crossover Frequency5.0 kHz
Cutout Width/Diameter6.5 in / 165.1 mm
Directivity Factor (Q) (Averaged 100Hz – 10kHz, @ 2kHz)4.3 and 4.2
Directivity Index (DI) dB (Averaged 100Hz – 10kHz, @ 2kHz)5.7dB and 6.2dB
Frequency Response (± 10 dB)125 Hz – 22 kHz
Frequency Response (± 3 dB)160 Hz – 20 kHz
Grille PropertiesStandard-Flange, Magnetic, Powder-Coated, White, Paintable, Steel
Low Frequency Voice Coil0.5 in / 12.7 mm
Low Pass Crossover12 dB per octave 2nd order
Magnetically BoostedNo
Max. Ceiling Thickness0.97 in / 24.6 mm
Max. Continuous Power RMS20W
Max. Program Power40 W
Minimum Impedance (Ω Ohms)15.5 Ω
Network Type: High Pass6 dB per octave 1st order
Nominal Impedance (Ω Ohms)16 Ω
Tweeter Driver.75″ Silk Dome
Woofer Driver4″ Treated Fiber Cone w/ Cloth Surround
Sensitivity dB @ 1W/1M87.5 dB
Sensitivity dB @ 2.83V/1M84.5 dB
Tap SelectorRotary Switch
Transformer Options25 / 70.7 / 100 V, 16 Ohm direct
Transformer Taps (25V/70.0V/100V)2.5W/20W/20W
Visible Diameter7.5 in / 190.5 mm
Visible Height0.33 in / 8.4 mm