4-inch, Full-range, In-Ceiling Loudspeaker

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4-inch, Full-range, In-Ceiling Loudspeaker

The 8124 is a 4-inch, full-range, cost-effective loudspeaker for commercial applications. The 8124 features high-fidelity performance in an easy to install package. The system’s high sensitivity drivers deliver maximum sound levels using minimal amplifier power. With its contemporary grill design, 70V/100V taps and an open-back design, the 8100 series brings elegance and performance to basic commercial sound systems, or any application not requiring a backcan for installation.


  • Clear, High-Fidelity Performance
  • Dog-ears for easy Blind Mount Installations
  • High Sensitivity (93 dB, 1W, 1m) for Maximum Power Efficiency
  • 6W Transformer for use of 70V / 100V Distributed Lines


  Version Language Size Uploaded
file type icon 8100 Series Spec Sheet
updated: มี.ค. 2021
    88.5 กิโลไบต์ มี.ค. 2021
file type icon Ceiling Speaker Accessory Guide
version B, updated: ม.ค. 2024
  231 กิโลไบต์ ม.ค. 2024
file type icon 8100 Series Bochure
updated: ต.ค. 2020
    820 กิโลไบต์ ต.ค. 2020
file type icon JBL Commercial Brochure
updated: เม.ย. 2020
    1.64 เมกะไบต์ เม.ย. 2020
file type icon Control Contractor Brochure (2024)
en version D, updated: ก.พ. 2024
en  14 เมกะไบต์ ก.พ. 2024
file type icon 8100 Series Declaration of Conformity
updated: ต.ค. 2020
    80.2 กิโลไบต์ ต.ค. 2020
platform icon Distributed System Design (DSD)
version 3.7, updated: พ.ย. 2023
3.7     1.07 เมกะไบต์ พ.ย. 2023
file type icon 8124 Hi Res Photo
updated: ต.ค. 2020
    195 กิโลไบต์ ต.ค. 2020
Speaker Tunings
file type icon Commercial, CBT, and AWC Tunings 220616
version A, updated: พ.ค. 2023
  557 กิโลไบต์ พ.ค. 2023
Simulation Data
file type icon JBL Pro ALL CLF Files
version 12-10-21, updated: พ.ค. 2023
12-10-21    24 เมกะไบต์ พ.ค. 2023

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Parts & Service


Drivers 4 in (100 mm), Full-range Driver
Frequency Range 60 Hz – 18 kHz
Sensitivity 93 dB (1 kHz – 8 kHz)
Coverage Angle 130° conical
Transformer Taps 6W, 3W, 1.5W (0.75W at 70V only)
Input Connectors Bare wires
Dimensions (Diameter x Depth) 8.1 in (206mm) x 3.5 in (89mm)
Weight 2.5lb (1.2kg)
Included Accessories Sculpted Grille
Optional Accessories MTC-8124C C-ring, MTC- Rail tile rails
Power Rating See transformer taps
Maximum SPL (1m) 101 dB ave. (top 70V/100V tap)
Color White
Baffle/Rim Plastic
Ceiling Cutout Size 175 mm diameter (6.9 in)
Plenum Usage Not intended for use in return air plenums
Backcan No


MTC-48TRx12 | Tile Rail for 4' x 4' Ceiling Tiles
MTC-48TRx12 Main photo
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Tile Rail for 4' x 4' Ceiling Tiles

MTC-48TRx12 is an accessory tile rail for installing many of JBL’s ceiling loudspeakers into 4 ft by 4 ft
(1200 x 1200 mm; 48 x 48 inch) ceiling tiles in suspended ceiling applications.

  • Can be used with any JBL ceiling speakers having the C-ring/tile-rail mounting system.
    Includes (at product release):
    • Control 24C/CT Micro & 24CT MicroPlus
    • Control 24C/CT, 26C/CT, 19CS/CST
    • Control 47C/T, 47LP, 47HC, 40CS/T, 42C
    • Control 226C/T
    • 8124/8128
    • Not for JBL speakers that install with tile bridges (such as CSS Series, 8138, C227C/CT, C300 Series models). Check with JBL Professional Customer Service for most up-to-date compatibility list.
  • Inverted V-groove provides support to the tile rail grid in case of tile failure while reducing vibration transfer to – and rattling from – ceiling tile grid system.
  • 1.2 mm (0.05 in) metal thickness provides the additional support required by the long span.
  • Multiple C-ring mounting holes. Additional hole locations drillable by installer.
  • One MTC-48TRx12 is a pack of 12 tile rails, enough for 6 speakers (2 per speaker).

MTC-8124C & MTC-8128C | C-Rings for 8124 and 8128 Speakers
MTC-8124C & MTC-8128C Main photo
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The MTC-8124C and MTC-8128C are integral clips for the MTC-RAIL that spread ceiling loading.  There are four pieces per carton.




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4-inch, Full-range, In-Ceiling Loudspeaker