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8" Coaxial Ceiling Loudspeaker with HF Compression Driver
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Control 328CT has been engineered from the ground up to deliver exceptional next-generation performance in a coaxial point source design 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.
  • 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 and optional backbox available.


Frequency Range (-10dB) 45 Hz – 18 kHz
Frequency Response (±3 dB) 60Hz – 16 kHz
Power Ratings See transformer taps
Impedance 8 ohms
Transformer Taps 68W, 34W, 17W, (& 8.5W @ 70V)
Sensitivity 93 dB (1 kHz - 16 kHz)
Coverage Angle 120° conical, constant directivity
Directivity Factor (Q) 7.0 (Avg 1k - 16kHz)
Directivity Index (DI) 8.5dB (Avg 1k - 16kHz)
Crossover Network 1.9 kHz, 3rd order (18 dB/oct) high-pass plus conjugate
Drivers LF Driver: 200 mm (8 in)
HF Driver: compression driver, 25 mm (1 inch) coil
Input Connectors Screw locking barrier strip for bare wire
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)
Plenum Usage Yes, with accessory backcan
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)