JBL Control 328CT Ceiling Loudspeaker

JBL Control 328CT Ceiling Loudspeaker
JBL Control 328CT Ceiling Loudspeaker
Item# JBL-Control-328CT
Availability: Usually ships the same business day

Product Description

JBL Control 328CT Ceiling Loudspeaker

Consistent 120° broadband pattern control covers an extremely large area.

Shaped mounting baffle provides the pattern control of a 300 mm (12 in) horn from a 200 mm (8 in) driver.

Components • 200 mm (8 in) woofer with Kevlarreinforced cone and 50 mm (2 in) voice-coil.

• 25 mm (1" exit) compression driver.

Extraordinary clarity for speech and vocals with extended frequency response for music.

250 Watt power handling with very high sensitivity provides high SPL capability.

Advanced high-slope crossover network for constant coverage and smooth, natural midrange.

Clean, contemporary grille and optional backbox available.


Control 328C and Control 328CT have been engineered from the ground up to deliver exceptional next-generation performance in a coaxial point source design ceiling loudspeaker. The combination of the low frequency cone and the shaped mounting baffle performs as a true 12 inch (300 mm) diameter waveguide for the high frequencies. A unique metal throat transitions seemlessly to the horn to eliminate high frequency beaming which is common among this category of speaker. The result is a coaxial speaker with wide, extremely consistent 120° coverage on a broadband basis. Component features include a Kevlarreinforced low frequency cone for reliability, well-damped surround for smooth frequency response, high temperature voicecoil and a reduced distortion design through saturated-gap magnet geometry. The high frequency driver features a pure titanium diaphragm for high sensitivity and long life, with diamond surround for resonance control and FerroFluid™ for increased power handling. The Control 328C and Control 328CT are easy to install. The removable multi-pin locking connector, with secure screw-down terminals, allows for pre-wiring the input wires for easy clip-on convenience during installation. The clean, contemporary look of the optional MTC-RG6/8 round grille is designed to suit high-end venues, offering a simple, elegant appearance that fits into a wide variety of décors. The optional MTC-300BB8 one cubic foot backcan is made of extra-thick 16 gauge steel and the top is lined with ½” medium density fiberboard. The transformer version Control 328CT comes with a pre-attached top quality, low saturation 68 Watt multi-tap transformer for 70V/100V distributed speaker lines. To ensure long life and reliability, Control 328C/CT passes JBL’s 100-hour torture power test, the toughest standard in the industry.


System: Frequency Range (-10 dB)1: 45 Hz – 18 kHz

Frequency Response (±3 dB)1: 60 Hz – 16 kHz

Coverage Pattern2: 120° conical, broadband

Directivity Factor (Q): 7.0 (Avg 1k - 16kHz)

Directivity Index (DI): 8.5dB (Avg 1k - 16kHz)

Long-Term System Power Rating, IEC3: 250 W (1000 W peak), 2 hrs 150 W (600 W peak), 100 hrs

Sensitivity (2.83V@ 1m): 93 dB4 measured half-space 98 dB5 computed for competitive comparison

Maximum SPL6: 118 dB cont ave (124 dB peak)

Crossover Network: 1.9 kHz, 3rd order (18 dB/oct) high-pass plus conjugate to HF, 2nd order low-pass to LF.

Nominal Impedance (328C): 8 ohms

Transformer Taps (328CT): 70V: 68W, 34W, 17W, 8.5W 100V: 68W, 34W, 17W

Transducers: Low Frequency Driver: Kevlar reinforced cone, 50 mm (2 in) voice coil.

High Frequency Driver: JBL 2412H-1 compression driver, 25 mm (1 in) voice coil.

Physical: Input Connector (328C): Removable locking connector with screw-down terminals. Max wire 12 AWG (2.5 mm2) 328C: 1) + in, 2) + loop out, 3) – loop out, 4) – in Tap Connection (328CT): 328CT: A) Common B) 8.5W@70V, 17W@100V C) 17W@70V, 34W@100V D) 34W@70V, 68W@100V E) 68W@70V, n/c@100V Safety Agency Rating: Suitable for use in air handling spaces, per U.L. -2043, U.L. 1480, NFPA90 & NFPA70A. In accordance with IEC60849 / EN60849, Transformer in CT model UL Listed per UL1876.

Baffle: Metal, round, 305 mm (12.0 in) diamter, driver premounted to baffle, ported. Baffle Attachment to MTC-300BB8 Backbox: Attach via 4 #10 x .75 in (19 mm) sheet metal screws. Grille Attachment to Baffle: 4 pcs 4 mm machine screws. Dimensions (H x W x D): 305 mm (12.0 in) diameter round baffle x depth from back of baffle of 160 mm (6.3in) on 328C & 218 mm (8.6 in) on 328CT. Net Weight: 328C: 4.5 kg (10.0 lbs) 328CT: 5.4 kg (12.0 lbs) Shipping Weight: 328C: 5.8 kg (12.7 lbs) 328CT: 6.7 kg (14.7 lbs) Included Accessories: Ported baffle pre-attached, plus transformer on 328CT. Optional Accessories: MTC-RG6/8 Grille, round contoured, white. MTC-300BB8 Backbox, 25 liters (1 cubic feet) MTC-300T150 Transformer, 150 W for use with 328C. 1 In half space (in ceiling) 2 Average 1 kHz to 10 kHz 3 IEC standard, full bandwidth pink noise with 6 dB crest factor. 4 Measured in half space (in ceiling), ave 100 Hz – 10 kHz. 5 Measured in full space with 6 dB added for half-space calculation. Method used by some European manufacturers, for comparison purposes. 6 Calculated based on power rating and measured half-space sensitivity, exclusive of power compression. JBL continually engages in research related to product improvement. Changes introduced into existing products without notice are an expression of that philosophy.