- 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 Kevlar-reinforced 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.
JBL CONTROL-328CT 8 in Coaxial Ceiling Loudspeaker with HF Compression Driver and Transformer
The Control 328CT has 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 (300mm) 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 Kevlar-reinforced low frequency cone for reliability, well-damped surround for smooth frequency response, high temperature voice coil 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 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.
Key Features:
Specifications
-
System:
- Frequency Range (-10 dB)1: 45 Hz – 18 kHz
- Frequency Response (±3 dB)1: 60 Hz – 16 kHz
- Coverage Pattern: 120°conical, broadband
- Directivity Factor (Q): 7.0 (Avg 1k - 16kHz)
- Directivity Index (DI): 8.5dB (Avg 1k - 16kHz)
- Long-Term System Power Rating, IEC:
- 250 W (1000 W peak), 2 hrs
- 150 W (600 W peak), 100 hrs
- Sensitivity (2.83V@ 1m):
- 93 dB measured half-space
- 98 dB computed for competitive comparison
- Maximum SPL: 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 UL1480, UL2043, NFPA90 & NFPA 70 when installed with UL listed backcan such as JBL MTC-300BB8. S7232/UL Listed, Signaling Speaker. Transformer UL registered per UL1876. In accordance with IEC60849/EN60849
- 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 218 mm (8.6 in) on 328CT.
- Net Weight: 5.4 kg (12.0 lbs)
- Shipping Weight: 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-SG6/8 Grille, square, contoured, white.
- MTC-300BB8 Backbox, 25 liters (1 cubic feet)
- Frequency Range (-10 dB)1: 45 Hz – 18 kHz
- Frequency Response (±3 dB)1: 60 Hz – 16 kHz
- Coverage Pattern: 120°conical, broadband
- Directivity Factor (Q): 7.0 (Avg 1k - 16kHz)
- Directivity Index (DI): 8.5dB (Avg 1k - 16kHz)
- Long-Term System Power Rating, IEC:
- 250 W (1000 W peak), 2 hrs
- 150 W (600 W peak), 100 hrs
- Sensitivity (2.83V@ 1m):
- 93 dB measured half-space
- 98 dB computed for competitive comparison
- Maximum SPL: 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
- 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.
- 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 UL1480, UL2043, NFPA90 & NFPA 70 when installed with UL listed backcan such as JBL MTC-300BB8. S7232/UL Listed, Signaling Speaker. Transformer UL registered per UL1876. In accordance with IEC60849/EN60849
- 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 218 mm (8.6 in) on 328CT.
- Net Weight: 5.4 kg (12.0 lbs)
- Shipping Weight: 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-SG6/8 Grille, square, contoured, white.
- MTC-300BB8 Backbox, 25 liters (1 cubic feet)
