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JBL Control® 24C/T

4" commercial in-ceiling speaker (Black)

4 Reviews | 1 question - 1 answer

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Item # 855CTL24BK

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Our take on the JBL Control® 24C/T

Standard in-ceiling speakers are great for background music on a quiet evening at home. But if you want to fill your place of business with high-quality sound, the JBL Control 24CT can provide the extra flexibility you need.

An in-ceiling speaker that's all business

Standard in-ceiling speakers are great for background music on a quiet evening at home. But if you want to fill your place of business with high-quality sound, the JBL Control 24CT can provide the extra flexibility you need.

These speakers feature multi-tap transformers for use with 70-volt or 100-volt audio systems, and 16 ohm nominal impedance allows plenty of power distribution options as well. The 4" woofer with butyl rubber surround and 3/4" titanium tweeter dish out clear sound and are built to last.

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Product Highlights:

  • coaxially mounted 4" woofer with butyl rubber surround and 3/4" titanium tweeter
  • handles up to 80 watts continuous program power
  • frequency response: 80-20,000 Hz
  • maximum SPL: 102 dB
  • sensitivity: 86 dB
  • 16 ohm nominal impedance
  • multi-tap transformer for 70V or 100V systems
    • does not have 8-ohm bypass, must be used with 70/100-volt amplifiers
  • formed steel back enclosure
  • step-by-step mounting instructions included
  • 6-5/8" cutout diameter
  • 7-1/4" mounting depth
  • weight: 8 lbs.
  • warranty: 5 years parts and labor
  • Our 60-day money-back guarantee

What's in the Box:

  • 2 In-ceiling speakers
  • 2 Grilles
  • 2 "C"-brackets
  • 4 Tile-rails
  • 4 Screws
  • 2 Cardboard cutout templates
  • Paint shield
  • Owner's Manual

Very happy to purchase. Great product.

Debo Aina, Lagos, Nigeria


JBL Control® 24C/T Reviews

Average Customer Review(s):

(4 Reviews)

JBL Control® 24C/T

Crutchfield customer from Asheville, NC on 12/4/2018

Crutchfield Customer Review (What's this?)

Very happy with sound quality. Used with my first commercial installation and the result was better than any I have contracted out.



Awesomely great.

Debo Aina from Lagos, Nigeria on 6/7/2018

Crutchfield Customer Review (What's this?)

Very happy to purchase. Great product.

Pros: Very aesthetically pleasing.


JBL Control® 24C/T

Crutchfield customer from Minneapolis, MN on 2/9/2017

Crutchfield Customer Review (What's this?)

Very helpful Crutchfield service helped our small non-profit design and select a voice/music system using 6 of these speakers. Good build quality and nice sounding. Cost seemed high for a 4" speaker but glad we spent the few extra dollars. Fast shipment as always.



JBL Control® 24C/T

Crutchfield customer from Platteville, WI on 12/5/2016

Crutchfield Customer Review (What's this?)

The speakers sound amazing. Great customer service.




Hands-on research

Features and Specs

Drivers per speaker 2
Woofer Size (inches) 4
Tweeter Size (inches) 1
System Frequency response 80-20k
Maximum SPL 102
Power Handling
Power rating 40
Peak Power rating 0
Width (inches) 7-3/4
Height (inches) 7-3/4
Depth (inches) 8-1/16
Weight 8 lbs

Product Research


Control Contractor Series In-Ceiling Speaker: The JBL Control 24BK is a compact ceiling speaker providing premium performance in background, foreground, and music, plus paging sound systems. The Control 24BK is perfectly suited for a wide variety of applications from professional offices and airports to restaurants and specialty retail stores. High power handling, wide frequency response and low distortion make the Control 24BK ideal for sound systems requiring a higher fidelity sound from ceiling loudspeakers. The premium performance capability ensures excellent sound character, providing pleasant, enveloping sound throughout the listening area.

Note: All JBL Control Contractor loudspeakers (both ceiling speakers and surface-mount models) are designed with a similar sonic signature, allowing for mixing and matching of the various models within an application, providing a similar tonal character throughout the entire listening area.

Two-Way Coaxial Design: Most compact of the JBL in-ceiling speakers, the Control 24BK contains a coaxially mounted 4" woofer and 0.75" titanium-coated tweeter, providing high-fidelity sound over an extremely wide coverage area.

  • 4" Polypropylene Woofer: The 4" woofer features a polypropylene-coated cone and pure butyl rubber surround for long life, even in high humidity environments. An aluminum voice coil former provides extra cooling for greater long-term power handling.
  • 0.75" Titanium Tweeter: The coaxially mounted 0.75" titanium coated tweeter provides crisp, clear highs. Diffraction-loading of the tweeter provides wide, even coverage of the listening area. The extremely broad 130° coverage pattern allows for fewer speakers to be used, making for a simpler and less expensive installation.

Computer-Optimized Ported Enclosure: The computer-optimized ported enclosure delivers warm, smooth bass response. Low frequency output can be further augmented with the addition of one of JBL's Control Contractor subwoofer models (sold separately).

70V/100V Compatible: Control 24BK includes a 30W multi-tap transformer for use in either 70.7V or 100V distributed-line systems. Taps are selected with a rotary switch conveniently located on the front panel, but protected under the grille, so that the speaker does not have to be removed to adjust tap settings.

  • 70V Taps: 30W, 15W, 7.5W, 3.7W
  • 100V Taps: 30W, 15W, 7.5W

Removable Locking Connector: Input connection is conveniently provided on a removable locking connector (included), providing secure connection via screw-down terminals and allowing a system to be pre-wired before installing the speaker for fast snap-on convenience. Separate connector terminals are available for the input and for the loop-through wires, making it easy to jumper the speaker signal to additional speakers. The input terminal plate provides strain relief for either bare wire, plenum cable, or 0.5" conduit. The terminal box is securely enclosed to meet safety codes. You will need to remove a Phillips-head screw to access connector terminals.

  • Input Terminals: Terminals 2 (+) and 3 (-) are the input terminals of the loudspeaker.
  • Loop-Thru Terminals: Terminals 1 (+) and 4 (-) are the loop-thru terminals to output connection to other speakers.

Mounting Options: Installation of the Control 24BK is quick and easy. The loudspeaker is packaged complete with the backcan, grille, support backing bracket, and tile rails. The entire installation can be accomplished without requiring access above the ceiling. A template is provided for marking the cutout. An innovative C-shaped support backing plate can be installed from below through the cutout to reinforce the top of the ceiling material. Tile bridge rails are included which can be screwed onto the C-plate to extend support to the T-channel grid in suspended ceiling installations. After the speaker is fitted through the cutout, it is held securely in place via three mounting tabs which tighten onto the C-plate, if used, or directly onto the ceiling material.

  • Frame Diameter: 7.75"
  • Cutout Diameter: 6.625"
  • Mounting Depth: 7.5"
Note: The Control 24BK backcan is made of formed steel and the speaker is suitable for use in air handling spaces, per U.L.-2043. An attachment loop is provided on the backcan for cabling to the building structure as a secondary support in seismic areas or where required by code.

Paintable: The speaker trim and grille are paintable to match any decor. A paint shield is provided for covering the drivers while painting the rim.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

JBL has been a good name in audio for a long time, so I was comfortable with the brand, but really the reason I bought was the recommendation of the Crutchfield representative, Roy. He took time to understand my set up, the area I was wanting the equipment for and made knowledgeable recommendations. [ Kirk  Mar 26, 2018 ]
We use them for our emergency broadcast at our facility. We like the clean look when installed in office and meeting rooms. They also sound great! [ NATHAN  Mar 06, 2018 ]

1 question already asked

We don't carry the grill as a replacement part but JBL should be able to point you to a retailer that does! I have 800-852-5776 for this support phone number My Bio: [ Paul  Mar 09, 2018 ]  Staff