JBL Control 445C/T
Premium Coverage Series – Two-way 5.25” Coaxial Ceiling Loudspeaker with RBI
Overview
The JBL Control 445C/T is a professional in-ceiling loudspeaker from the Premium Coverage Series, engineered for superior sonic performance, wide bandwidth, and consistent coverage. It is designed for applications requiring high-quality sound reproduction in commercial and professional environments.
The loudspeaker features JBL's exclusive conical Radiation Boundary Integrator® (RBI) technology, which acts as a large waveguide for the tweeter. Low-frequency sound is projected through specially designed apertures in the RBI, ensuring seamless integration of coverage between the coaxially mounted drivers. This design results in extremely consistent sound character with minimal variation across the listening space.
Its wide coverage pattern allows for the use of fewer loudspeakers compared to speakers with less consistent coverage control, while simultaneously providing better area coverage. The system is tuned to pair well with the JBL Control 440CS/T subwoofer for applications requiring enhanced bass response.
Key Features
- Coaxially mounted 130 mm (5.25 in) woofer and 20 mm (0.75 in) soft-dome tweeter.
- Stylish bezel-less grille that blends elegantly into any room design.
- Broadband pattern control featuring JBL's Radiation Boundary Integrator® (RBI) technology.
- Frequency Range: 55 Hz - 20 kHz.
- Power Handling: 75W (300W peak) with a 60W multi-tap transformer for 70V/100V distributed systems.
- 8 Ω nominal impedance allows paralleling up to two speakers on a 4 Ω amplifier.
- UL-registered transformer designed for low-saturation, high-quality, low-distortion sound.
- Integrated backcan and C-ring support backing plate for quick and easy installation.
- Paintable white grille; optional black round and white square grilles are available.
- UL 1480A and UL 2043 listed.
Specifications
System
| Parameter | Value |
|---|---|
| Frequency Range (-10 dB) | 55 Hz - 20 kHz |
| Frequency Response (±3 dB) | 70 Hz - 20 kHz |
| Power Capacity | 224 W Continuous Program (2 hrs.); 112 W (448 W Peak), Continuous Pink Noise (2 hrs.); 75 W (300 W Peak) Continuous Pink Noise Power (100 hrs.) |
| Sensitivity | 88 dB |
| Nominal Coverage Angle | 120° conical |
| Directivity (Q) | 4.5 |
| Directivity Index (DI) | 6.5 dB |
| Rated Maximum SPL @ 1m | 108.5 dB continuous pink noise (114.5 dB peak) |
| Nominal Impedance | 8 Ω |
| Minimum Impedance | 6.6 Ω at 260 Hz |
| Transformer Taps | 70 V: 60 W, 30 W, 15 W & 7.5 W; 100 V: 60 W, 30 W, 15 W |
| Recommended Protective High-Pass Filter Frequency | 60 Hz (24 dB/oct LR) |
| Transformer Insertion Loss | 0.6 dB @ 7.5 W; 0.8 dB @ 15 W; 0.9 dB @ 30 W; 0.9 dB @ 60 W |
| Maximum Input Voltage | 27.2 V RMS, 54.4 V peak (2 hrs at 8 Ω input) |
| Overload Protection | PTC power limiting to protect network and transducers from occasional overload. |
| RBI Driver Integrator | LF acoustic loading, tapered apertures. Back of loading plate functions as LF waveguide, foam-lined for smooth midrange frequency response. Provides smooth, consistent coverage of listening space. Horn-loaded HF driver integrated into front of RBI for maximum coherence. |
| Safety Agency Ratings | Suitable for use in air handling spaces per UL 2043, NFPA 90A & NFPA 70. S7232/UL Listing per UL 1480A Speakers for Commercial and Professional Use. Listed per CSA C22.2, no. 205 Signal Equipment. Transformer UL registered. |
| Environmental | IP rating: IP33 per EN/IEC 60529. RoHS: Per EU RoHS Directive 2011/65/EU, as amended by EU Delegated Directive (EU) 2015/863. Operating temperature: 0° C to 45 °C. |
Transducers
| Component | Description |
|---|---|
| LF Driver | 130 mm (5.25 in) treated paper cone, high-performance magnet, 25 mm (1 in) EISV voice coil on Kapton voice coil former. |
| HF Driver | 20 mm (0.75 in) cloth soft-dome, neodymium magnet assembly, PSVCAW wire on Polyimide voice coil former. |
Enclosure
| Component | Description |
|---|---|
| Enclosure Material | Backcan: Powder-coated formed steel. Baffle: PC/ABS, flammability rated UL 94 5VB. |
| Grille | Bezel-less, SPCC grille with powder-coat finish, decorative minimal-edge trim, flammability-rated backing (removable and re-applicable for painting). Stock grille is white (RAL9003), round. Black (RAL9004) round and white square available as optional accessories. Safety tether with tether stake pre-attached to grille. |
| Termination | Two removable locking euro-block 2-pin connectors with screw-down terminals for bare wire. Connectors paralleled for input and loop-thru. Min. wire 20 AWG (0.5 mm²); Max. wire 12 AWG (3.3 mm²). Terminal cover hinged with 1 captive screw for attachment. |
| Wire Entrance/Exit Location | Multi-use strain relief (for wires or flex conduit) provided. Optional positioning on either top panel (for easiest installation through ceiling cutout) or side of backcan (for lowest depth profile above ceiling). |
| Attachment Fastening | 4 dog-ear attachment tabs for ceiling thicknesses between 1 mm and 70 mm ceiling board thickness. |
Dimensions and Accessories
| Parameter | Value |
|---|---|
| Reinforcing Brackets | Zinc-plated C-ring and 2 tile rails included for additional support above ceiling. Additional safety tab on backcan for secondary safety cable. |
| Dimensions (H x Dia) | 255 mm (10.4 in) H x 260 mm (10.2 in) dia. (240 mm (9.6 in) from bottom of ceiling tile to top of backcan with wire exit positioned on side of backcan). |
| Ceiling Cutout Size | 223 mm (8.8 in) |
| Net Weight (each) | 4.3 kg (9.48 lbs) |
| Shipping Weight (pair-packed in carton) | 13.83 kg (30.49 lbs) |
| Included Accessories (per speaker) | Two 2-pin removable locking euro-block connectors, 1 cable strain relief, white round bezel-less grille (with pre-attached safety tether and tether clip), cutout template, C-ring, 2 tile rails (fits both 2 x 4 ft and 600 x 1200 mm tiles), C-ring/tile-rail screws, 1 seal cover, 2 rubber boots. |
| Optional Accessories | JBL-MTC-445BG black (RAL9004) round grille; JBL-MTC-445SG white (RAL9003) square grille; JBL-MTC-426NC new construction bracket; JBL-MTC-426MR mud-ring construction bracket; JBL-MTC-48TRX4 tile rail for 4' x 4' ceiling tiles. |
| Colors | Stock grille is white (RAL9003), paintable. |
| SKU # | JBL-C445C/T |
Graphical Data Descriptions
Frequency Response & Impedance: A graph displays Sound Pressure Level (SPL) in decibels (dB) on the Y-axis against Frequency in Hertz (Hz) on the X-axis, measured in half-space (mounted in ceiling) at 8 Ω, on-axis. The curve shows a generally flat response from approximately 70 Hz to 20 kHz. A second curve shows Impedance in Ohms (Ω) on the Y-axis against Frequency in Hertz (Hz) on the X-axis. The impedance starts at around 8 Ω, peaks sharply around 260 Hz, and then settles to a minimum of 6.6 Ω at 260 Hz before rising again at higher frequencies.
Beamwidth: A graph illustrates the -6 dB Beamwidth in degrees on the Y-axis against Frequency in Hertz (Hz) on the X-axis. The beamwidth is approximately 120° at lower frequencies (e.g., 100 Hz) and gradually narrows as frequency increases, reaching around 90° at 1 kHz, 80° at 5 kHz, and approximately 70° at 10 kHz, before widening slightly at higher frequencies.
Dimensions: Diagrams show the physical dimensions of the loudspeaker. Key measurements include a total height of 255 mm (10.4 in) and a diameter of 260 mm (10.2 in). The depth from the ceiling tile to the top of the backcan is 240 mm (9.6 in). The required ceiling cutout diameter is 223 mm (8.8 in). The diagrams also illustrate the C-ring and tile rail mounting system and the location of wire entry points.
Company Information
HARMAN Professional Inc. 8500 Balboa Blvd. Northridge, CA 91325 USA
© 2025 HARMAN International Industries, Incorporated. All rights reserved. Features, specifications and appearance are subject to change without notice.
Visit: www.jblpro.com
