JBL Professional Control 328CT - 8″ Coaxial Ceiling Speaker with HF Compression Driver and 120° Conical Coverage (70/100 V)
The JBL Professional Control 328CT is a coaxial point-source in-ceiling loudspeaker designed from the ground up to deliver next-generation performance in demanding commercial installations. Its shaped mounting baffle acts as a 12″ equivalent waveguide for the tweeter, achieving extremely consistent 120° pattern control across the entire bandwidth. The coaxial array combines a 200 mm (8″) Kevlar-reinforced cone woofer with a 50 mm voice coil and a 25 mm (1″ exit) compression driver , delivering exceptional vocal clarity and extended music response. The CT version incorporates a 68W multi-tap transformer for 70/100V lines, ideal for distributed systems, while maintaining a clean aesthetic with a contemporary grille and optional accessories.
Main features
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Constant 120° coverage : Wideband conical pattern that covers large areas with fewer speaker points.
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“Shaped baffle” mounting deflector : provides control of a 300 mm (12″) horn starting from an 8″ transducer.
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Premium components : 8″ woofer with Kevlar reinforced cone and 50 mm VC + 1″ compression driver (titanium diaphragm, ferrofluid ).
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High performance : sensitivity 93 dB (2.83 V/1 m, half-space) and max. SPL 118 dB (top tap 70/100 V) with Q 7.0 and DI 8.5 dB .
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Extended response : 60 Hz–16 kHz (±3 dB) , usable range 45 Hz–18 kHz (−10 dB) .
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System power management (transducer capacity): 250 W (continuous pink noise, 2 h) / 150 W (100 h), peaks 1000/600 W.
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Advanced crossover : 1.9 kHz with HP 18 dB/oct (plus conjugate) and LP 12 dB/oct for a smooth and natural midrange.
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Operation at 70/100 V : taps 68/34/17 W (and 8.5 W at 70 V ) by means of integrated low saturation transformer.
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Modular architecture : round metal baffle of Ø 305 mm ; installed depth 218 mm (CT model); weight 5.4 kg .
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Accessories : Pre-installed backcan MTC-300BB8 (25 L) and optional contoured grilles MTC-RG6/8 (round) or MTC-SG6/8 (square).
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Standards : Suitable for air handling spaces ( UL1480/UL2043 , NFPA-90A/70) when installed with UL listed backcan (e.g., MTC-300BB8).
Product benefits
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Fewer speakers, same coverage : constant 120° directivity reduces spots without sacrificing intelligibility.
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Superior voice clarity and balanced musical response thanks to the coaxial design with compression driver.
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Integration flexibility : version with transformer for 70/100 V with multiple sockets, ideal for retrofit and multi-floor projects.
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Professional installation : pre-installable baffle + backcan system with plug-in connectors for quick and secure wiring.
Use cases
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Retail, restaurants and hotels that require broad coverage and discreet aesthetics.
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Offices, meeting rooms, education and healthcare with priority given to intelligibility and uniformity.
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Museums, convention centers and corporate spaces where high SPL with consistent ringing is required.
Project description
JBL Control 328CT coaxial ceiling loudspeaker (with 70/100 V transformer); 120° conical coverage; frequency response 60–16 kHz (±3 dB) / 45–18 kHz (−10 dB) ; sensitivity 93 dB (2.83 V/1 m, half-space); Q 7.0 , DI 8.5 dB ; max SPL 118 dB (top tap); crossover 1.9 kHz (HP 18 dB + conjugate / LP 12 dB); taps 70 V: 68/34/17/8.5 W , 100 V: 68/34/17 W ; transducers: LF 200 mm (Kevlar-reinforced cone, VC 50 mm ) + HF compression 25 mm (1″ exit, titanium diaphragm); Metal baffle Ø 305 mm , installed depth 218 mm (CT); weight 5.4 kg ; optional accessories: MTC-300BB8 (backcan), MTC-RG6/8 (round grille) and MTC-SG6/8 (square grille).
