The JBL Control 328CT is a passive 8″ coaxial ceiling speaker with a multi-tap transformer designed for voice amplification and foreground music reproduction in waiting rooms, offices, retail stores, and restaurants. With a low-saturation transformer for compatibility with a 70V/100V power amplifier (available separately), this 2-way speaker provides a long-term power capacity of 250W (1000W peak). The Control 328CT is equipped with a durable 8″ Kevlar-reinforced cone and a titanium-diaphragm compression driver, yielding an extended frequency response of 60 Hz to 16 kHz.

Product Specifications:

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

Transformer Taps: 68W, 34W, 17W, (& 8.5W @ 70V)

Frequency Response (3 dB): 60Hz 16 kHz

Coverage Angle: 120 conical, constant directivity

Impedance: 8 ohms

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

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

Sensitivity: 93 dB (1 kHz – 16 kHz)

Maximum SPL (1m): 118 dB (top 70V/100V tap)

Crossover Network: 1.9 kHz, 3rd order (18 dB/oct) high-pass plus conjugate

Dimensions (H x W x D): 305 mm (12.0 in.)

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

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)

Included Accessories: Ported baffle pre-attached, plus transformer on 328CT.

Plenum Usage: Yes, with accessory backcan