A full-range ceiling speaker from JBL, their LCT 81C/T is designed to lay into a 2ft x 2ft US-style suspended grid ceiling, with no cutting of ceiling tiles required, making for an easy and cost-effective installation with a minimum of mess. Its low profile depth of only 4" (100mm) allows the speaker to fit in locations where deeper loudspeakers do not.This loudspeaker is designed to provide excellent performance for paging and light-to-medium music in a wide variety of applications, including education classrooms, business music systems, retail stores, music/paging systems, airports, reception/waiting rooms, lounges, courtrooms, meeting rooms, and more. The very high sensitivity of 96 dB provides maximum sound level, even at low tap settings.It consists of a 8" (200mm) dual-cone driver with a very high 96 dB sensitivity. The driver features a 1" (25mm) diameter voice coil with a Kapton coil-former and high-temperature wire for better power dissipation and long-term reliability. The speaker's built-in 10 Watt transformer provides versatility by allowing use on 100 V or 70 V distributed loudspeaker lines, as well as at 8 Ω (low impedance) for driving directly from a low impedance power amplifier. Adjusting is convenient via a rotary switch on the side of the rear enclosure. Two safety seismic attachment tabs are provided for securing to ceiling deck, plus 4 holes are provided -- one in each corner. The color of the perforated grille is white.JBL LCT 81C/T Features:High-efficiency 8" (200mm) dual-cone driverEasy lay-in installation into 2ft x 2ft US-style suspended grid ceilings. No cutting of ceiling tiles is necessaryPerforated metal grille includedCombined 70 V/100 V and low impedance direct operation20 Watts at 8 Ω (low-impedance) direct setting10 Watt multi-tap at 70 V/100 V with taps at 10 W, 5 W , 2.5 W (and 1.3 W for 70 V only)Very low-profile at just 4.1" (103mm) deep, to fit into ceilings that are shallow or that contain obstructionsEasy bare-wire connection in protected compartment. Wire entrance from either top or side via knock-outVery high 96 dB sensitivity turns power from small amplifiers into maximum sound level for listenersDesigned for high speech intelligibility100° coverage pattern (conical)UL1480A and UL2043 certifications for use in ceiling plenum spacesJBL LCT 81C/T Specifications:Transducer: High-efficiency 8" (200mm) dual-cone driver with 1" (25mm) diameter voice coil, Kapton coil former, and high-temperature voice coil wire.Frequency Range (-10 dB): 100 Hz – 16 kHzNominal Sensitivity: 96 dBNominal Coverage Angle: 100° conical coverage (ave. 1 kHz - 4 kHz)Rated Maximum SPL: 108 dB @ 1m (3.3ft) average, 108 dB peak (at 8 Ω setting)Nominal Impedance: 8 Ω (in Direct/Thru 8 Ω setting)Transformer Taps: 10 W, 5 W, 2.5 W @ 70 V or 100 V (plus 1.3 W @ 70 V only)Recommended Protective High Pass: 90 Hz high-pass (24 dB/octave) for 8 Ω direct or any 70 V or 100 V tap settingPower Capacity:40 Watts Continuous Program Power (at low-Z)20 Watts Continuous Pink NoiseInput Connector: Bare-wire inside protected in touch-proof wiring compartment.Tap Selector: Rotary switch accessible from side of backcanMaterials: Steel rear enclosure, front baffle, and perforated grilleGrille Color: WhiteDimensions: 23.9" x 23.9" x 4.1" (607 x 607 x 103mm)Net Weight: 15.7 lbs. (7.1 kg)Shipping Weight: 18.3 lbs. ea/36.4 lbs. per pair-pack (8.3 kg ea/16.5 kg per pair-pack)Ceiling Cutout Size: No cutout required—speaker drops into ceiling gridSuspension / Safety-Seismic Attachment Points Two tabs on back baffle, plus 4 holes in corners JBL LCT 81C/T 8 Low-Profile Lay-In 2'X2' Ceiling Tile Speaker.