JBL Professional C24CT-BK Foreground Ceiling Loudspeaker
Key Features
- Coaxially mounted 100 mm (4 in) woofer with butyl rubber surround and 19 mm (¾ in) titanium coated diffraction-loaded tweeter
- High power, wide frequency response and low distortion for high sound level capability
- Wide coverage allows fewer speakers, reducing the cost of the installed sound system without sacrificing performance
- Packaged with grille, back can and tile rails for fast installation and easy dealer stocking
- Black baffle and grille works well in black and dark ceiling
Description
The Control 24CT-BK is a compact ceiling speaker providing premium performance in background, foreground and music-plus-paging sound systems. The Control 24CT-BK 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 24CT-BK 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.
The Control 24CT-BK includes a multi-tap transformer for 70V/100V systems.
The computer-optimized ported enclosure delivers warm, smooth bass response. Low frequency output can be further augmented with the addition of one of the Control Contractor subwoofer models.
The 100 mm (4 in) 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.
The coaxially mounted 19 mm (¾ in) 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.
Specifications
- Half-space (flush mounted in ceiling)
- Continuous Pink Noise rating is IEC-shaped pink noise with a 6 dB crest factor for 100 hours continuously. Continuous Program power is a conservative expression of the system’s ability to handle normal speech and music program material and is defined as 3 dB above the Continuous Pink Noise Rating.
- Half-space (in ceiling), average 100 Hz to 10 kHz 4 500 Hz to 4 kHz
- JBL continually engages in research related to product improvement. Changes introduced into existing products without notice are an expression of that philosophy.
Input connection is conveniently provided on a removable locking connector (included), providing secure connection via screw-down terminals and allowing a system to be prewired 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 1/2-inch conduit (12 mm I.D.). The terminal box is securely enclosed to meet safety codes.
The speaker trim and grille are paintable to match any decor. A paint shield is provided for covering the drivers while painting the rim.
Installation of the Control 24CT-BK is quick and easy. The loudspeaker is packaged complete with the back can, 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
The Control 24CT-BK 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.
The 30W multitap transformer is 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.
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.
1/3 Octave Polars
Architectural Specifications
The loudspeaker shall be of in-ceiling design, consisting of a 100 mm (4 in) low frequency transducer, a coaxially-mounted 19 mm (3/4 in) high frequency transducer, and frequency dividing network installed in a ported enclosure. The low frequency voice coil shall be 25 mm (1 in) in diameter and the coil former shall be of aluminum for maximum heat dissipation.
Performance specifications of a typical production unit shall be as follows: Measured sensitivity (SPL at 1m [3.3ft] with 4V input, averaged from 100 Hz to 10 kHz bypassing the transformer) shall be at least 86 dB-SPL. Usable frequency response shall extend from 80 Hz to 20 kHz (10 dB below rated sensitivity in half- space) with no external equalization.
The high frequency transducer shall be horn-loaded to more evenly cover a minimum 130° polar conical coverage area.
The backcan shall be constructed of formed steel and the baffle of UL94V-0 fire rated medium impact polystyrene. An enclosed terminal box shall be included proving strain relief for use with either plenum-rated wire, 1/2 in (13 mm inside diameter) conduit, or flexible conduit up to 22 mm (7/8 in) outside diameter. The external wiring shall be accomplished via a removable lockable wiring connector with screw-down terminals to provide both secure wire termination and prewiring capability before loudspeaker installation. An attachment loop shall be provided on the back panel for cabling to building structure as a secondary support point.
The system shall include a support backing plate to reinforce the ceiling material and tile support rails for use on either 2 x 4 ft or 600 x 1200 mm suspended ceiling tiles and which can all be installed from beneath the ceiling tile.
Overall front face diameter shall not exceed 195 mm (7.7 in), overall depth from the bottom of the ceiling shall not exceed 183 mm (7.2 in), and shall weigh no more than 2.7 kg (6 lb).
The loudspeaker shall be equipped with transformer for use in either 70.7 or 100V distributed-line speaker systems, with taps selectable by rotary switch located on the front panel so that the speaker does not have to be removed to adjust tap settings. Taps shall be nominally 30W @ 70V, 15W@ 70V (30W @ 100V), 7.5W @70V (15W @ 100V), and 3.7W @ 70V (7.5W @ 100V).
The loudspeaker shall be the JBL Model Control 24CT-BK.
Mounting Dimensions
Dimensions in mm (inches)
Frequently Asked Questions
Do ceiling speakers play music well? Ceiling speakers are indeed excellent for playing music. Similar to being at a concert hall or live music event, they have the power to immerse you in a surround sound experience.
Room Size: assuming all other factors are equal, a larger room will require more power to fill. You need a stereo with at least 25 watts per channel with effective speakers or 40 watts per channel with non-efficient speakers for a space that is 18 feet by 18 feet and has 9-foot ceilings. Consider those figures to be low? They aren’t
Do ceiling speakers need to be plugged in? No, ceiling speakers normally perform as passive speakers, which means they are driven by speaker wires connected to an external amplifier because they lack inbuilt amplifiers. To do this, the binding posts on the amplifier are linked to each ceiling speaker.
The majority of budget-friendly ceiling speakers provide excellent sound and value for the money. So if you’re trying to upgrade your home audio while keeping to a strict budget, you don’t need to worry about it taking up your entire budget.
Therefore, is a back box necessary for in-ceiling speakers? Yes. If a back box is not placed, the sound quality of your in-ceiling speakers will be diminished, and this will result in noise pollution in other areas of your home.
Converter Cable
Right now, it’ll probably be a digital optical output. By putting in an analogue wire from your TV to the amplifier and switching to line output on your TV, you may enjoy TV sound through your ceiling speaker system.
How effectively do the ceiling speakers play music? In fact, ceiling speakers are great for playing music. They are capable of giving you an immersive surround sound experience similar to what you may enjoy at a concert or live music performance.
Take action now!
Drill a hole for the wires.
Check to see that the amplifier is unplugged, then shut off the breaker.
Install the wiring.
Start connecting the wires to the terminals on the ceiling speakers.
Connect the wires’ other side to the terminals of the amplifier.
Start your breaker and give it a try.
Does a subwoofer need to accompany ceiling speakers? A subwoofer will be useful in handling the bass and low-end frequencies even if ceiling speakers are capable of providing all of them. Additionally, it vastly enhances your sound system’s overall sound quality.
What Surround Sound Quality Can In-Ceiling Speakers Deliver? Thank you for your inquiry. Naturally, the answer is “yes.” Simply point your in-ceiling stereo speakers in the desired location before configuring your system to offer that immersive additional layer of sound.
If you want a more immersive audio experience, ceiling speakers are a terrific addition to a home theatre. Although they must be made specifically for ceilings, they are a great addition to a surround sound system.
Ceiling speakers are a great addition to a home theatre if you want a more immersive audio experience. They are a fantastic addition to a surround sound system even if they have to be manufactured specifically for ceilings.
Selecting a project Box Speaker
The only option you have for blown-in insulation is a speaker box. It is also the best option for keeping your house insulated because the speaker box can be covered with insulation to retain sound quality.
A smartphone or other internet-connected device is frequently used to wirelessly control Bluetooth ceiling speakers. The content from the smartphone will be received by the speaker’s Bluetooth chip and played through the speaker.
As a general rule, if your room is a typical square or rectangle, make sure they are situated evenly apart and down the center of the room (preferably at least 4 feet).
The number of surfaces that a speaker is placed close to determines how much bass you will hear. An in-ceiling subwoofer installed in the middle of a wall can gain 3dB of bass by moving up the wall until it is next to the ceiling.
In-ceiling speakers can be installed in walls and provide a sound that is quite similar to that of in-wall speakers. The major difference you’ll notice is size. In-wall speakers are typically larger than in-ceiling speakers.
You can place the centre there based on how high your ceiling is. As we previously noted, if the speaker is pointed toward the listening position and isn’t too far away from the TV, this can function pretty well. Utilizing an in-ceiling speaker for your centre channel is an additional choice.
