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SoundTube CM42-EZs-II

4" commercial in-ceiling speaker (Black)

Item # 298C42E2B

This shallow-mount speaker can be installed in spaces where other in-ceiling speakers won't fit.

This shallow-mount speaker can be installed in spaces where other in-ceiling speakers won't fit.


Item # 298C42E2B

In stock

$120.00 -$6.00 Outlet savings

$114.00 each

Other options

About the SoundTube CM42-EZs-II

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After we gather your information, we’ll send you a detailed system plan. It will include a link to a pre-filled shopping cart. Ordering is easy, and delivery is fast.

A great fit in tight spaces

SoundTube's CM42-EZs-II is less than 4" deep, so it can be installed in spaces where other in-ceiling speakers won't fit. Each speaker has a 4" treated fiber woofer with cloth surround and 3/4" silk dome tweeter. 

A built-in transformer tap lets you use one amplifier to drive several speakers in an efficient distributed audio system. Convenient mounting arms make installation easier.

Product highlights:

  • 4" treated fiber woofer with cloth surround and 3/4" silk dome tweeter
  • 100° conical coverage
  • shallow-mount drawn steel back enclosure
  • built-in transformer for use with commercial sound systems
    • 70V taps: 1.25, 2.5, 5, 10 and 20 watts
    • 100V taps: 2.5, 5, 10 and 20 watts
    • 16-ohm transformer bypass
  • power handling: 40 watts continuous program power (when using transformer bypass)
  • frequency response: 160-20,000 Hz (-3dB)
  • maximum SPL: 100.5 dB
  • tile bridge, conduit clamp, and paint shield included
  • painted steel grille
  • constant-tension winged mounting hardware makes installation easier
  • cutout diameter: 6-1/2"
  • depth: 3-3/4"
  • weight: 4 lbs.
  • warranty: 5 years
  • Our 60-day money-back guarantee
  • MFR # CM42-EZS-II-BK

What's in the box:

  • One in-ceiling speaker (black)
  • Grille w/attached safety restraint
  • Terminal cover plate
  • Conduit clamp
  • Paint guard
  • Installation instructions
  • Quality control sheet

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Crutchfield response

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More details on the SoundTube CM42-EZs-II

Russ B.

Features & specs

Drivers per speaker 2
Woofer Size (inches) 4.0
Tweeter Size (inches) 0.75
System Frequency response 160-20k
Maximum SPL 100.5
Power Handling
Power rating 20
Peak Power rating ---
Width (inches) 7-1/2
Height (inches) 4-3/16
Depth (inches) 3-13/16
Weight 4 lbs

Product Research


Overview: The Soundtube CM42-EZ-II is a 2-way, blind-mount, in-ceiling speaker featuring a coaxially mounted 4" woofer and a 0.75" tweeter. The speaker features transformer tap settings for 25, 70, and 100 volt operation, and also includes a 16Ω bypass. Designed specifically for indoor paging and background music, the CM42-EZ-II is ideal for hotels, restaurants, airports, churches, medical facilities, and more.

Drivers: The CM42-EZ-II features a 4" treated fiber woofer with cloth surround along with a 1" silk dome tweeter, all mounted in a sealed steel backcan enclosure. This combination delivers high efficiency and performance across the operating bandwidth with a frequency response of 160Hz to 20kHz (-3db). Able to handle up to 20 watts RMS (40 watts Program power) and with a sensitivity of 87.5 dB, the CM42-EZ-II can provide clear powerful sound with a coverage angle of up to 170˚ @ 2kHz, and 100˚ average coverage angle @ 2-10kHz.

Enclosure: The CM42-EZ-II is housed in a galvanized steel backcan with an ABS plastic front baffle along with a painted steel-mesh grille. The grille can be painted to match the room color and includes an attached safety restraint lanyard. The CM42-EZ-II enclosure carries both UL1480A and UL2043 certifications and is CE and RoHS approved.

Mounting: Installation of the speaker is done blind-mount using Soundtube's constant-tension winged assemblies that come pre-mounted to the speaker. Once the speaker is slid into the ceiling opening 2 Phillips-head screws on the front of the speaker are tightened. This expands out the SpeedWing mounting arms providing tension on the backside of the mounting surface. The CM42-EZ-II can be mounted to ceilings ranging in thickness from 0.04 to 1.5 inches, including drop-ceilings using the optional Tile Bridge. Three secondary attachment points are provided on the back of the speaker for an additional safety line.

25/70/100 Volt: The CM42-EZ-II can be used in 25, 70, and 100 volt applications and includes a 16Ω bypass selection. A tap selection dial on the front of the speaker allows for easy configuration without having to remove the speaker from the ceiling. The following tap settings are available:

  • 25 Volt: 0.2W, 0.4W, 0.7W, 1.3W, and 2.5W
  • 70 Volt: 1.3W, 2.5W, 5W, 10W, and 20W
  • 100 Volt: 2.5W, 5W, 10W, and 20W
  • 16Ω

Terminals: A 4-position ceramic terminal strip is provided for wiring connections. One set of terminals provides the signal input while the other set provides a pass-thru for daisy-chaining multiple speakers. Each terminal can accommodate speaker wire up to 10AWG in size and includes a set-screw to hold the wire firmly in place.


  • Speaker Type: 4.0", coaxial, in-ceiling
  • Woofer: 4.0" treated fiber cone with cloth surround
  • Tweeter: 0.75" Silk dome
  • Impedance (nominal): 16Ω
  • Sensitivity (1W @ 1M): 87.5dB
  • Frequency Response (-3 dB): 160Hz - 20kHz
  • Frequency Response (-10 dB): 125Hz - 22kHz
  • Maximum Program Power: 40W
  • Maximum Continuous Power: 20W
  • Maximum SPL: 100.5dB
  • Coverage Angle (-6dB @ 2kHz): 170˚
  • Coverage Angle (-6dB @ 10kHz): 95˚
  • Coverage Angle (Avg. 2 to 10kHz): 100˚
  • Crossover Frequency: 5.0kHz
  • Tap Settings:
    • 25 Volt: 0.2W, 0.4W, 0.7W, 1.3W, and 2.5W
    • 70 Volt: 1.3W, 2.5W, 5W, 10W, and 20W
    • 100 Volt: 2.5W, 5W, 10W, and 20W
    • 16Ω
  • Enclosure Material: Sealed drawn-steel backcan, ABS front baffle
  • Grille: Painted steel-mesh
  • Inputs: 4-Terminal ceramic barrier strip
  • Dimensions: Diameter = 7.462", Depth (incl. grille) = 4.150"
  • Mounting Depth: 3.80"
  • Cutout Diameter: 6.402"
  • Maximum Ceiling Thickness: 0.04" to 1.50"
  • Weight: 4.0 lbs.

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