CS 120P

Plenum Rated Ceiling Tile Enclosure for CS 3T and CS 26T Plus Speakers
Key Features
  • Optional 1' x 2' (30.5 cm x 61 cm) ceiling tile enclosure for the CS 3T and CS 26T Plus ceiling speakers
  • Fast-installing enclosure speeds installation; no tile bridge necessary
  • UL 2043 plenum rated enclosure
  • Low profile, 5" (12.7 cm) deep enclosure for plenum environments
  • Compatible with US 2' x 2' ceiling grids and metric 600 mm x 600 mm ceiling grids
  • Reinforced enclosure minimizes acoustical vibrations
The Extron CS 120P
Model Version Description Part #
CS 120P SpeedMount Enclosure, Pair 70-976-01

The Extron CS 120P is an optional, plenum rated ceiling tile enclosure for the Extron CS 3T full‑range and CS 26T Plus two‑way ceiling speakers. The enclosure installs quickly into 2' x 2' or 600 mm x 600 mm suspended ceilings. It features a shallow 5" (12.7 cm) profile, which simplifies installation into congested ceiling spaces around piping and ducts. The integrated tile bridge rests with the ceiling tile on the grid, evenly distributing the weight of the enclosure and the speaker. 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. The CS 120P works with the CS 3T and CS 26T Plus as an innovative two‑piece system that accommodates division-of-labor installations.

In a division-of-labor installation, a low-voltage contractor can begin installing a ceiling speaker during rough-in by placing the 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 or CS 26T Plus speaker to the wiring and securing it into the enclosure. This innovative design greatly simplifies ceiling speaker installation and saves costs, especially when a large quantity is needed for a facility.

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. The CS 120P enclosure is sold in pairs.


  CS 123T Full-Range 70/100 V SpeedMount Ceiling Speaker System
  CS 3T Full-Range Open Back Ceiling Speakers with 70/100 V Transformer
  CS 1226T Plus Two-Way 70/100 V SpeedMount Ceiling Speaker System
  CS 26T Plus Two-Way Open Back Ceiling Speakers with 70/100 V Transformer


SpeedMount® Ceiling Speaker System
CS 1226T Plus system — CS 120P and CS 26T Plus
      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, UL 2043, UL 1480, NFPA 90A, NFPA 70
UL listed for use in plenum air spaces:
UL 2043 listed for heat and smoke release (only when CS 26T Plus is used with CS 120P).
UL 1480 listed for commercial and professional audio systems.
         EMI/EMC CE
      Product warranty 5 years parts and labor
       NOTE     All nominal levels are at ±10%.
       NOTE     Specifications are subject to change without notice.
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 (2.7 kg)
      Shipping weight Pair: 16 lbs (7 kg)
CS 26T Plus Speaker Cartridge
   Audio/acoustic and electrical
      Speaker type 2-way ceiling speaker
      Frequency range 42 Hz to 20 kHz, -10 dB, half space (per IEC 60268-5)
      Frequency response 58 Hz to 16 kHz, +/- 3 dB, half space
      Power capacity 60 W (rms) continuous pink noise (per IEC 60268-5)
120 W (rms) continuous program
      Nominal sensitivity 86 dB SPL, 1 W @ 1 m, half space
      Nominal impedance 8 ohms per speaker
      Crossover frequency 2.5 kHz
      Nominal coverage angle 112° conical coverage
      Rotary switch taps
         70 V input 32 W, 16 W, 8 W, 4 W, 2 W, 8 ohms direct
         100 V input 32 W, 16 W, 8 W, 4 W, 8 ohms direct
      Woofer (1) 6.5" (165 mm) polypropylene cone with moisture resistant coating
      Tweeter (1) 0.75" (19.1 mm) PEI dome
      Overload protection Full range power limiter, protecting the tweeter, woofer, and crossover
      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 or optional ceiling mounting kit
      Enclosure type
         Enclosure materials High-impact, fire-resistant (UL94V-0) plastic
         Enclosure design Plastic, open back, infinite baffle
      Grille material Steel
      Enclosure outer dimensions 3.97" H x 10.3" diameter
(10.1 cm H x 26.2 cm diameter)
3.63" (9.2 cm) from front (bottom) of ceiling tile to top of connected captive screw connector
      Cutout dimensions 9.2" diameter (23.4 cm diameter)
      Product weight Single: 5.7 lbs (2.6 kg)
      Shipping weight Pair: 15 lbs (7 kg)
Shipping Dimensions and Weights
    Part # Height Width Depth Weight
    70-976-01 26.0" (66.0 cm) 10.63" (27.0 cm) 14.75" (37.5 cm) 16.1 lbs (7.3 kg)

Panel Drawing

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