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° (2–10 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. Included accessories: Tile bridge, UL-listed 0.5-inch flex conduit clamp, paint shield and two wire nuts.

Specifications: CM42-EZs-IIMounting hardware included
Nominal Impedance16 ohm
Impedance (min)15.5 Ohm
Sensitivity dB @ 2.83V/1M84.5dB
Sensitivity dB @ 1W/1M (2)87.5dB
Frequency Response (± 3 dB)160 Hz - 20 kHz
Frequency Response (±10 dB)125 Hz - 22 kHz
Max. Program Power40W
Max. Continuous Power RMS20W
Max. Power SPL @ 1 M100.5dB
Directivity Factor (Q) (Averaged 100Hz - 10kHz, @ 2kHz)4.3 (Average 100 Hz - 10 kHz) 4.2 (2 kHz)
Directivity Index (DI) dB (Averaged 100Hz - 10kHz, @ 2kHz)5.7dB (Average 100 Hz - 10 kHz) 6.2dB (2 kHz)
Tap Selector6 Position rotary switch with transformer bypass
70.7 Volt Transformer Taps20w / 100.5dB
100 Volt Transformer Taps (dB)20w / 100.5dB
25 Volt Transformer Taps (dB)2.5w / 91.5dB
Transformer Options25 / 70.7 / 100 Volt 16 Ohm direct
Transducer - Low Frequency Driver4" Treated Fiber Cone w/ Cloth Surround
Transducer - High Frequency Driver.75″ Silk Dome
Network Type: Low Pass12dB per octave, 2nd order
Network Type: High Pass6dB per octave, 1st order
Coverage Angles-6 dB @ 500 Hz /
ColorsBlack / White / Custom
Inputs4 position ceramic terminal connector
Backcan Diameter146.8 mm / 5.78 in
Backcan Height95.3 mm / 3.75 in
Visible Diameter190.5 mm / 7.5 in
Visible Height8.4 mm / 0.33 in
Mounting Hole Diameter165.1 mm / 6.5 in
Weight1.8 kg / 4 lbs
Shipping Weight2.3 kg / 5 lbs
Accessories IncludedUL-Listed Flex Conduit Clamp, Paint Shield, Wire Nuts, Tile Bridge, Hole Template
Packaging1 per box
Regulatory - ULApproved UL1480A & UL2043
Regulatory - CEApproved
Regulatory - RoHSapproved
Regulatory - IPnot planned
Regulatory - EN54approved