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Shallow-mount in-ceiling speakers

Item # 855LCT81CT

This speaker is designed for high speech intelligibility and mounts easily in 2' x 2' suspended grid ceilings.

This speaker is designed for high speech intelligibility and mounts easily in 2' x 2' suspended grid ceilings.

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Item # 855LCT81CT

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$258.00 pair

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About the JBL LCT 81C/T

Eric A.

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A perfect fit for some suspended grid ceilings

JBL LCT 81C/T speakers are a low-profile solution that fits easily into a 2' x 2' suspended grid ceiling. Each speaker requires just 4" of mounting depth, so it can fit in spaces where other speakers can't. Its 8" full-range driver offers excellent speech intelligibility. Each speaker handles up to 20 watts at 8 ohms, and a built-in 70/100-volt transformer tap offers flexibility in power distribution in a commercial sound system.

Product highlights:

  • pair of speakers with 8" full-range drivers
  • designed for easy installation in 2' x 2' suspended grid ceilings
  • 8" bare-ended speaker wire attached
  • handles up to 20 watts continuous program power
  • 100° conical coverage
  • frequency response: 100-16,000 Hz (-10 dB)
  • maximum SPL: 108 dB
  • sensitivity: 96 dB
  • multi-tap transformer for 70V or 100V systems
    • 1.3, 2.5, 5 and 10-watt taps at 70 volts
  • nominal impedance: 8 ohms
Dimensions and warranty:

What's in the box:

  • 2 Ceiling-tile speakers w/ attached 8" speaker wire (bare-ended)
  • Features & Specifications sheet

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More details on the JBL LCT 81C/T

Russ B.

Features & specs

Drivers per speaker 1
Woofer Size (inches) N/A
Tweeter Size (inches) N/A
System Frequency response 100-16k
Maximum SPL 108
Power Handling
Power rating 20
Peak Power rating ---
Width (inches) 23-7/8
Height (inches) 23-7/8
Depth (inches) 4-1/8
Weight 15.7 lbs

Product Research


Overview: The JBL LCT 81C/T is a full-range, 70/100V, ceiling speaker designed to lay into a standard 2' x 2' US-style suspended grid ceiling, with no cutting of ceiling tiles, making for an easy and cost-effective installation. They feature a low-profile 4" depth, allowing them to fit in locations where space is not available for deeper speakers. The ceiling speakers can handle up to 40W of continuous program power, in 8Ω mode, and up to 10W in a 70/100V configuration.

Applications: The LCT 81C/T speakers are designed to provide excellent performance for paging and light-to-medium level music in locations, including classrooms, business music systems, retail stores, airports, lounges, reception/waiting rooms, and more.

Construction: The JBL ceiling speakers feature a single 8" dual-cone driver with a very high 96dB of sensitivity, providing maximum sound level, up to 114dB maximum SPL (8Ω), even at low tap settings. The driver features a 1" diameter voice coil with a Kapton coil-former and high-temperature wire for better heat dissipation and long-term reliability. The single driver is housed in a sealed, steel enclosure with a perforated metal grille, that carries both a UL1480A and UL2043 certifications for use in ceiling plenum spaces.

70/100V/8Ω: The LCT 81C/T ceiling speakers can be run in either a low-impedance (8Ω) mode, handling up to 40W of program power, or in a 70 or 100V application, with up to 10W of power handling. Connection to the speaker is done through a pre-attached 8" section of bare-ended speaker wire (18AWG). The speaker wire input is protected by a removable metal cover that includes punch-outs for passing the wire through. A rotary tap dial on the rear side of the enclosure provides the following tap settings:

  • 70V: 1.3W, 2.5W, 5W, 10W
  • 100V: 2.5W, 5W, 10W
  • 8Ω: Bypass

Mounting: The JBL LCT 81C/T speakers have been designed to lay into a standard US-style 2' x 2' suspended ceiling grid, with no cutting of ceiling tiles. The speaker also features a shallow 4" mounting depth for use in tight spaces. The back baffle includes 2 tabs and 4 pre-drilled holes for use as safety/seismic  attachment points (safety cables not included).


  • Frequency Range (-10 dB): 100Hz - 16kHz
  • Power Capacity:
    • Low-Z (8Ω): 40 Watts continuous program power, 20 Watts continuous pink noise
    • 70/100V: 10W maximum power
  • Nominal Sensitivity: 96 dB
  • Nominal Coverage Angle: 100˚ conical coverage
  • Maximum SPL: 108 dB average, 114 dB peak
  • Nominal Impedance: 8Ω (Tap set for 8Ω bypass)
  • Transformer Taps:
    • 70 Volt: 1.3W, 2.5W, 5W, and 10W
    • 100 Volt: 2.5W, 5W, and 10W
    • 8Ω: Bypass
  • Driver: 8" Dual cone (full-range)
  • Input Connector: Pre-attached 8" bare-ended speaker wire (18AWG) with protective "touch-proof" metal cover
  • Safety/Seismic Attachment Points: Two tabs on back of speaker baffle, and 4 pre-drilled holes in corners
  • Materials: Steel rear enclosure, front baffle, and perforated grille
  • Safety: UL1480A, UL2043, NFPA90 and NFPA70, S7232/UL listed, suitable for use in air handling spaces, fire alarm & signaling systems
  • Dimensions: Width = 23.875", Length = 23.875", Depth = 4.125"
  • Net Weight: 15.7 lbs. (each)

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Customer Q&A

1 question already asked

Is this speaker good for back speaker surround sound?
[ JEFFERY  Jul 20, 2021 ]
1 answer
Thanks for your question. For information on comparing two or more models I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They will be able to help determine the differences and help you make the best choice for your system and your budget.
[ KENNETH  Jul 26, 2021 ]  Staff

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