JBL 322C, 328CT Control 328C/CT System Assembly, Assembling the Control 328C/CT into the Back Can

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CONTROL 328C/CT SYSTEM ASSEMBLY

Ceiling Preparation - Cut a 12.2 inch (310 mm) diameter hole in the ceiling to allow sufficient room for the loudspeaker baffle.

Assembling the Control 328C/CT into the Back Can

-After inserting the Control 328C/CT into the back can, align the mouting holes without weld nuts to the holes with clip nuts on the back can. These are the mounting points that will be used to secure the Control 328 baffle and driver to the backcan.

Non-Weld nut mount point

Weld nut mount point

Next, using 4 pcs - #10 x 0.75 in (19 mm) sheet metal screw, attaching the baffle / driver to the back can. Be sure to match the mouting holes without weld nuts to clip nuts on back can.

Finally, using 4 pcs - M4 x 38 mm powder coated machine screws, attach the metal grille to the baffle. Be sure to match the grille mouting holes to the weld nuts on the baffle assembly.

IMPORTANT! When installing the MTC-300BB8 with a Control 328C/CT, see “Securing Speaker Assembly to the Building Structure” details below.

4 pcs - #10 x 0.75 in (19 mm) sheet metal screw for attaching the baffle / driver to the back can. Match to clip nuts on back can. (Included with MTC- 300BB8. )

4 pcs - M4 x 38 mm powder coated machine screws for attaching the metal grille to the baffle. (Included with JBL Professional grilles.)

IMPORTANT: SECURING SPEAKER ASSEMBLY TO THE BUILDING STRUCTURE

The backcan must be secured to the building structure by qualified personnel in accordance with safe installation practices. Use suspension materials, connection fixturing, and methods that are appropriate for the building structure and installation conditions. Employ a minimum 5:1 safety factor for each suspension point, or higher if required by code. For MTC-300BB8 with a Control 328C/CT a 5:1 safety factor requires that each suspension point be rated to support a minimum of 57 kg (125 lbs).

JBL Professional Control 300 Series 7

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Contents User’s Guide Table of Contents Product Description Control 322CT Shown Product Feature IdentificationHookup Schemes for Subsequent Speakers Wiring InstructionsFigure B Parallel System Hookup Diagram Assembling the Control 328C/CT into the Back Can Control 328C/CT System AssemblyControl 321C/CT, 322C/CT & 312CS System Assembly Using a different brand compatible back box Using JBL Professional’s MTC-300BB12Back Box Optional Accessories ACCESSORIES, Maintenance & Contacting JBLListed SpecificationsNorthridge, CA 91329 USA

312CS, 300 Series, 328C, 322CT, 328CT specifications

JBL, a well-renowned name in the audio industry, has long been associated with innovation and superior sound quality. Among its impressive lineup, the JBL 321C, 321CT, 322C, 328CT, and 322CT stand out for their remarkable features, cutting-edge technologies, and versatile characteristics, ensuring an exceptional listening experience.

The JBL 321C is designed with a sleek, modern aesthetic, making it a stylish addition to any setting. This compact speaker delivers clear and balanced sound, thanks to its advanced driver technology and well-engineered acoustics. The inclusion of a high-frequency driver enhances the overall soundstage, providing crisp highs and detailed mid-range frequencies. This model is perfect for smaller spaces, ensuring that users still experience robust audio performance without overwhelming their environment.

Moving to the JBL 321CT, this variant introduces the convenience of a built-in transformer, making it suitable for commercial installations where efficient power usage is key. Like its counterpart, it boasts exceptional audio fidelity, ensuring that it can easily adapt to various applications, such as retail spaces or hospitality environments. Its reliability and sound quality make it a smart choice for professionals seeking a robust audio solution.

The JBL 322C and 322CT models further enhance this series by incorporating dual-speaker configurations. This design philosophy increases sound dispersion and volume output. With the 322C, users can expect a rich audio experience that fills larger rooms, making it ideal for home theaters and other entertainment spaces. Meanwhile, the 322CT expands functionality with its transformer setup, making it a prime choice for commercial use while delivering excellent sound quality.

Lastly, the JBL 328CT stands as a flagship option in the series. This model combines advanced technologies, such as a powerful woofer and an optimized high-frequency driver, to produce an impressive sound profile. It features an enhanced bass response, making it perfect for music enthusiasts who crave depth in their audio experience. The 328CT is designed for both home and professional environments, offering flexibility without compromising sound fidelity.

All these models emphasize JBL’s commitment to high-quality sound, reliability, and aesthetics. Their ability to deliver clarity across diverse music genres, combined with their versatility for both residential and commercial use, make the 321C, 321CT, 322C, 328CT, and 322CT exceptional choices for anyone looking to enhance their audio experience. Whether in a cozy living room or a bustling public venue, these speakers promise to deliver unparalleled sound quality that embodies the true essence of JBL's audio legacy.