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SoundTube CM400i

4" commercial in-ceiling speaker (Black)

Item # 298CM40IB

This speaker has a wide dispersion pattern and offers your customers a top-notch listening experience.

This speaker has a wide dispersion pattern and offers your customers a top-notch listening experience.

Item # 298CM40IB

In stock
$182.00 each

Other options

About the SoundTube CM400i

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Designed for clarity

SoundTube's CM400i in-ceiling speaker is designed to give your customers a top-notch listening experience. Each in-ceiling speaker has a 4" polypropylene woofer and a ferrofluid-cooled 3/4" convex aluminum tweeter. Its 95° conical dispersion pattern provides wide coverage from a single speaker.

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" polypropylene woofer with 1" ferrofluid-cooled convex aluminum tweeter
    • 95° conical coverage
  • drawn steel back enclosure
  • built-in transformer for use with commercial systems
    • 70-volt taps: 2.5, 5, 10 and 20 watts
    • 100-volt taps: 5, 10 and 20 watts
    • 4-ohm transformer bypass
  • power handling: 40 watts continuous program power (when using transformer bypass)
  • frequency response: 90-22,000 Hz (-3dB)
  • maximum SPL: 100 dB
  • tile bridge, conduit plate, Euroblock connector and paint shield included
  • paintable steel grille with powder-coated finish
  • fixed-wing mounting hardware makes installation easier
  • cutout diameter: 6-5/8"
  • depth: 6-9/16"
  • weight: 5.5 lbs.
  • warranty: 5 years
  • Our 60-day money-back guarantee
  • MFR # CM400I-BK

What's in the box:

  • One in-ceiling speaker (black)
  • Grille w/attached safety line
  • 4-Pin Euroblock connector
  • Paint guard
  • Terminal cover plate
  • Installation instructions

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Crutchfield response

<< >>

More details on the SoundTube CM400i

Russ B.

Features & specs

Drivers per speaker 2
Woofer Size (inches) 4
Tweeter Size (inches) 1.0
System Frequency response 90-22k
Maximum SPL 100
Power Handling
Power rating 20
Peak Power rating ---
Width (inches) 8-3/16
Height (inches) 7-11/16
Depth (inches) 7-3/16
Weight 5.5 lbs

Product Research


Overview: The Soundtube CM400i is a 2-way, blind-mount, in-ceiling speaker featuring a coaxially mounted 4" woofer and a 1" tweeter in a drawn aluminum backcan and ABS baffle. The speaker features transformer tap settings for 25, 70, and 100 volt operation, and also includes a 4Ω bypass. Designed specifically for indoor background to mid-level SPLs, the CM400i is ideal for schools, court-houses, retail stores, hotels, conference rooms, and more.

Drivers: The CM400i features a 4" polypropylene woofer with a rubber surround along with a 1" convex titanium tweeter with FerroFluid cooling, all mounted in a ported aluminum backcan enclosure. This combination delivers high efficiency and performance across the operating bandwidth with a frequency response of 90Hz - 22kHz (-3db). Able to handle up to 20 watts RMS (40 watts Program power) and with a sensitivity of 87 dB, the CM400i can provide clear powerful sound with a coverage angle of up to 95˚ (averaged from 2 - 10kHz).

Enclosure: The CM400i is housed in a drawn aluminum backcan with a ported ABS plastic front baffle providing added musicality with a bass response down to 75Hz (-10 dB). Soundtube's BroadBeam Ring technology offers extended midrange clarity and ultra wide off-axis performance. The speaker includes a painted steel-mesh grille that can be painted to match the room color and includes an attached safety restraint lanyard. The grille is magnetically held in place on the speaker, making installation and removal easy. The CM400i enclosure carries both UL1480 and UL2043 certifications and is CE and RoHS approved.

Mounting: Installation of the speaker is done blind-mount using a constant-tension fixed-wing mounting system. Two winged assemblies come pre-mounted to each side 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 mounting arms providing tension on the backside of the mounting surface. The CM400i can be mounted to ceilings ranging in thickness from 0.025 to 1.87 inches, including drop-ceilings using the optional Tile Bridge. A secondary attachment point is provided on the back of the speaker for an additional safety line (not included).

25/70/100 Volt: The CM400i can be used in 25, 70, and 100 volt applications and includes a built-in 20 watt transformer along with a 4Ω 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: 0.4W, 0.7W, 1.3W, and 2.5W
  • 70 Volt: 2.5W, 5W, 10W, and 20W
  • 100 Volt: 5W, 10W, and 20W
  • 4Ω

Terminals: A 4-teriminal Euroblock connector on top of the speaker 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", coaxial, in-ceiling
  • Woofer: 4" Polypropylene cone with butyl rubber surround
  • Tweeter: 1.0" Convex titanium with waveguide
  • Impedance (nominal): 4Ω
  • Sensitivity (1W @ 1M): 87dB
  • Frequency Response (-3 dB): 90Hz - 22kHz
  • Frequency Response (-10 dB): 75Hz - 22kHz
  • Maximum Program Power: 40W
  • Maximum Continuous Power: 20W
  • Maximum SPL: 100dB
  • Coverage Angle (-6dB @ 2kHz): 100˚
  • Coverage Angle (-6dB @ 10kHz): 65˚
  • Coverage Angle (Avg. 2 to 10kHz): 95˚
  • Crossover Frequency: 1.8kHz
  • Tap Settings:
    • 25 Volt: 0.4W, 0.7W, 1.3W, and 2.5W
    • 70 Volt: 2.5W, 5W, 10W, and 20W
    • 100 Volt: 5W, 10W, and 20W
    • 4Ω
  • Enclosure Material: Ported drawn-aluminum backcan, ABS front baffle
  • Grille: Painted steel-mesh
  • Inputs: 4-Terminal Euroblock
  • Dimensions (incl. grille): Diameter = 8.171", Height = 7.684"
  • Dimensions (w/o grille): Diameter = 8.0", Height = 7.45"
  • Mounting Depth: 7.10"
  • Cutout Diameter: 6.54"
  • Maximum Ceiling Thickness: 0.025" to 1.87"
  • Weight: 5.5 lbs.

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