CS 123T

Full-Range 70/100 V SpeedMount Ceiling Speaker System
Key Features
  • Patented two-piece speaker system for suspended ceilings in division-of-labor installations
  • Enclosure and speaker cartridge can be purchased as individual components and installed separately by low-voltage and AV system contractors
  • Provides significant time and cost savings in ceiling speaker installation
  • 3" (76 mm) full-range driver
  • 165° conical dispersion provides wide coverage and allows for flexible speaker placement
  • 8 ohm direct or 70/100 volt operation on a six position, behind-the-grille selector
The Extron CS 123T
Model Version Description Part #
CS 123T Full-Range SpeedMount Speaker System, Pair 42-242-03
CS 3T Full-Range, Open Back Speaker, Transformer, Pair 60-1463-03
CS 120P SpeedMount Enclosure, Pair 70-976-01

The Extron CS 123T SpeedMount® Ceiling Speaker System is a patented low profile, plenum rated two-piece speaker system. It provides an extremely wide 165° conical dispersion for flexibility in speaker spacing. The system is designed for applications where high intelligibility and maximum coverage is desired in paging applications and low ceiling installations. The innovative system consists of the CS 120P plenum rated enclosure and a CS 3T full-range speaker cartridge. The enclosure installs quickly into 2' x 2' (61 cm x 61 cm) or 600 mm x 600 mm suspended ceilings. The speaker cartridge features a 3" (76 mm) full-range driver, and can be used in 70/100 volt or 8 ohm operation. The CS 123T is available as a complete assembly, or the CS 120P and CS 3T can be purchased separately to accommodate division-of-labor installations.

The unique, patented two-piece design of the SpeedMount Ceiling Speaker System greatly simplifies installation of ceiling speakers and saves costs, especially when a large quantity is needed for a facility. Instead of waiting until the final phase of installation, when ceiling access is limited, a low-voltage contractor can begin during rough-in by placing a CS 120P enclosure into the ceiling grid, and running speaker cable through it. This leaves the AV installer with a simple procedure of connecting the CS 3T speaker cartridge to the wiring and securing it into the enclosure.

1' x 2' Plenum Rated Enclosure

The CS 120P plenum rated enclosure features a shallow 4.9" (12.4 cm) profile, which simplifies installation into congested ceiling spaces around piping and ducts. The integrated tile bridge of the enclosure rests with the ceiling tile on the grid, evenly distributing the weight of the enclosure and the CS 3T. This avoids the need to assemble V-rails and C-rings, greatly reducing the number of installation steps and the chance of losing installation hardware. Additionally, the CS 120P is reinforced to minimize acoustical vibrations.

Compatible with US and International Ceiling Grids

The CS 120P features removable sizing tabs, which allow the enclosure to be placed into US-style 2' x 2' suspended ceilings. The tabs can be removed, allowing the CS 120P to be installed into metric 600 mm x 600 mm ceilings.

Full-Range Speaker Cartridge

The CS 3T speaker cartridge installs quickly and easily into the CS 120P enclosure. It delivers full-range audio reproduction, and a wide conical dispersion of 165 degrees for vocal clarity and broad coverage. The CS 3T is optimized for voice reproduction and paging applications. It features a power rating of 16 watts continuous pink noise and 32 watts continuous program capacity.

This speaker cartridge offers both direct 8 ohm or 70/100 volt operation with a behind-the-grille, six position power selector switch. For room balancing with 70/100 volt systems, the behind-the-grille power selector switch allows for 16, 8, 4, 2, and 1 watt settings in 70 volt operation, and 16, 8, 4, and 2 watt settings for 100 volt operation.

The CS 3T features a thin-edged bezel for a refined appearance on the ceiling. The grille attaches magnetically to the baffle and quickly snaps into place. The white grille and bezel can be painted to match the architectural elements of the environment.


  SPK 14 14 AWG Speaker Cable
  SPK 16 16 AWG Speaker Cable
  SPK 18 18 AWG Speaker Cable
  MPA 152 Plus Stereo Amplifier - 15 Watts Per Channel
  MPA 601 Mono 70/100 V Amplifier - 60 Watts
  XPA U 358 Eight Channel Low and High Impedance Amplifiers
35 Watts Per Channel
  XPA U 358C Eight Channel Combo Amplifier
35 Watts Per Channel
  XPA U 1004 Four Channel Low and High Impedance Amplifiers
100 Watts Per Channel
  XPA U 1004C Four Channel Combo Amplifier
100 Watts Per Channel
  XPA U 1002 Two Channel Low and High Impedance Amplifiers
100 Watts Per Channel
  XPA U 1004 SB Four Channel Bridgeable Output Amplifier
100/200 Watts Per Channel
  XPA U 2002 SB Two Channel Bridgeable Output Amplifier
200/400 Watts Per Channel
  XPA 1002 Two Channel Low and High Impedance Amplifiers – 100 Watts Per Channel
  XPA 2001 Mono 70/100 V Amplifier - 200 Watts
  XPA 2002 Two Channel Amplifier - 200 Watts Per Channel
  XPA 2003C Three Channel Combo Amplifier - 200 Watts Per Channel
  XPA 4002 Two Channel Amplifier - 400 Watts Per Channel
  NetPA U 1004 Four Channel Power Amplifiers with Dante and DSP
100 Watts Per Channel
  NetPA U 1002 Two Channel Power Amplifiers with Dante and DSP
100 Watts Per Channel
  NetPA 1001-70V AT Mono 70 V Audio Power Amplifier with Dante - 100 Watts
  NetPA 502 AT Two Channel Audio Power Amplifier with Dante - 50 Watts Per Channel
  SM 3 SpeedMount Compact Full-Range Surface Mount Speakers
  SM 26 SpeedMount Two-Way Surface Mount Speakers with 6.5" Woofer
  SM 28 SpeedMount Two-Way Surface Mount Speakers with 8" Woofer


CS 123T SpeedMount® Ceiling Speaker System
CS 123T system — CS 120P and CS 3T
      Temperature/humidity Storage: -40 to +158 °F (-40 to +70 °C) / 10% to 90%, noncondensing
Operating: +32 to +122 °F (0 to +50 °C) / 10% to 90%, noncondensing
      Mounting Ceiling mountable with included hardware
      Regulatory compliance 
         Safety CE, NFPA 70, NFPA 90A
UL listed for use in plenum air spaces:
Meets UL 2043 for heat and smoke release (only when CS 3T is used with CS 120P).
Meets UL 1480 for commercial and professional audio systems.
         Environmental Complies with the appropriate requirements of RoHS and WEEE.
      Product warranty 5 years parts and labor
CS 120P Plenum Enclosure
      Package 2 plenum rear enclosures (1 pair)
      Enclosure type
         Enclosure materials Aluminized fiberglass, plastic, MDF, steel
         Enclosure design 1' x 2' (30.5 cm x 61 cm) tapered cube
      Insulation Glass polyfill
      Enclosure outer dimensions 23.7" L x 11.7" W x 4.9" D
(60.1 cm L x 29.7 cm W x 12.4 cm D)
      Cutout dimensions 9.2" (23.4 cm) diameter
      Product weight Single: 6.0 lbs (2.72 kg)
CS 3T Speaker Cartridge
   Audio/acoustic and electrical
      Speaker type 1-way full range in-ceiling speaker
      Frequency range 118 Hz to 20 kHz, -10 dB, half space (per IEC 60268-5)
      Power capacity 16 W (rms) continuous pink noise (per IEC 60268-5)
32 W (rms) continuous program
      Nominal sensitivity 83 dB SPL, 1 W, 1 m, 8 ohms direct, half space (per IEC 60268-5)
      Nominal impedance 8 ohms per speaker
      Nominal coverage angle 165° conical coverage (1 kHz to 4 kHz, weighted 2 kHz - 4 kHz)
      Rotary switch taps
         70 V input 16 W, 8 W, 4 W, 2 W, 1 W, 8 ohms direct
         100 V input 16 W, 8 W, 4 W, 2 W, 8 ohms direct
      Driver (1) 3" (76.2 mm) paper cone
      Overload protection Full range power limiter
      Input/output connectors (1) 5 mm captive screw connector, 4 pole with loop out
      Package 2 speakers (1 pair)
      Mounting Ceiling mountable with CS 120P enclosure
      Enclosure type
         Enclosure materials High-impact, fire-resistant (UL94V-0) plastic
         Enclosure design Plastic, open back, infinite baffle
      Grille material Steel
      Enclosure outer dimensions 3.0" H x 10.3" diameter
(7.6 cm H x 26.2 cm diameter)
Height is from front (bottom) of ceiling tile to top of withdrawn locking arms.
      Cutout dimensions 9.2" diameter (23.4 cm diameter)
      Product weight Single: 3.4 lbs (1.6 kg)
    NOTE     All nominal levels are at ±10%.
    NOTE     Specifications are subject to change without notice.
Shipping Dimensions and Weights
    Part # Height Width Depth Weight
    42-242-03 25.75 lbs (11.68 kg)


Application Diagram

Panel Drawing

Panel Drawing
© 2020 Extron. Specifications are subject to change without notice.