JBL Control 328C 8″ Coaxial Ceiling Loudspeaker with HF Compression Driver


Control 328C has been engineered from the ground up to deliver exceptional next-generation performance in a coaxial point source design ceiling loudspeaker.

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  • 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 Kevlarre inforced 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


Frequency Response (-10dB) 45 Hz – 18 kHz
Power Rating IEC Long-Term System Power Rating: 250 W continuous pink noise (1000 W peak), 2 hrs 150 W continuous pink noise (600 W peak), 100 hrs
Sensitivity (1W, 1m) 93 dB (1 kHz – 16 kHz)
Frequency Response (±3 dB) 60Hz – 16 kHz
Coverage Angle 120° conical, constant directivity
Directivity Factor (Q) 7.0 (Avg 1k – 16kHz)
Directivity Index (DI) 8.5dB (Avg 1k – 16kHz)
Maximum SPL (1m) 118 dB (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
Impedance 8 ohms
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)
Input Connectors Screw locking barrier strip for bare wire
Drivers LF Driver: 200 mm (8 in)
HF Driver: compression driver, 25 mm (1 inch) coil
Color White
Safety Agency 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.
Backcan formed steel (wood-lined; accessory)
Baffle/Rim Metal, round, driver pre-mounted to baffle, ported.
Ceiling Cutout Size 310 mm (12.2 in) diameter (for MTC-300BB8 backcan)
Optional Accessories MTC-RG6/8 Grille, round contoured, white. MTC-SG6/8 Grille, square, contoured, white. MTC-300BB8 Backbox, 25 liters (1 cubic feet)
Plenum Usage Yes, with accessory backcan