CONTROL 321C/CT, 322C/CT & 312CS SYSTEM ASSEMBLY

Ceiling Preparation - Cut a 14.9 x 14.9 inch (378 x 378 mm) hole in the ceiling to allow sufficient room for the loudspeaker baffle.

Using JBL Professional’s MTC-300BB12

 

IMPORTANT!

 

When installing the

Back Box

--

The

MTC-300BB12 is

 

 

MTC-300BB12 with

compatible with two common mounting

 

 

a Control 321C/CT,

systems

for

installing

the

loudspeaker

 

322C/CT & 312CS

/ baffle to the back box; either of these

 

models see “Securing

mounting systems may be utilized. Screws

 

Speaker Assembly to

are included with the MTC-300BB12 Back

2 Points Each Side

the Building Structure”

Box.

 

 

 

 

 

 

details below.

 

 

 

 

 

 

 

Using 4 pcs - M4 x 38mm powder coated

 

1 Point Each End

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.

 

 

 

 

 

 

4 pcs - M4 x 38mm powder

 

 

 

 

 

 

 

 

 

 

 

 

 

 

coated machine screws for

 

 

 

 

 

 

 

attaching the metal grille to

 

 

 

 

 

 

 

the baffle. (Included with JBL

 

 

6 pcs - #10 x .75 in (19mm) sheet

 

Profesional grilles.)

 

 

 

 

 

 

metal screw for attaching the

 

 

 

 

driver / baffle to the back box.

 

 

 

 

Match to clip nuts on back box.

 

 

Using a different brand compatible back box

--Screwholes in the metal baffle are provided corresponding with two common mounting systems. Utilize the system that works with that particular back box.

4 pcs - M4 x 14mm sheet metal screw for attaching the driver / baffle to the back box. Match to corners on back box.

1 Point Each Corner

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-300BB12 with a Control 321C/CT, 322C/CT or 312CS, a 5:1 safety factor requires that each suspension point be rated to support a minimum of 156 kg (345 lbs).

JBL Professional Control 300 Series 9

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JBL 322CT, 328CT, 321CT manual Using JBL Professional’s MTC-300BB12, Back Box, Using a different brand compatible back box

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.