User manual JBL Control 328CT

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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  
Back Box -- The MTC-300BB12 is  
compatible with two common mounting  
systems for installing the loudspeaker  
When installing the  
MTC-300BB12 with  
a Control 321C/CT,  
322C/CT & 312CS  
models see “Securing  
Speaker Assembly to  
the Building Structure”  
details below.  
baffle to the back box; either of these  
mounting systems may be utilized. Screws  
are included with the MTC-300BB12 Back  
2 Points Each Side  
Using 4 pcs - M4 x 38mm 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  
Point Each End  
pcs - M4 x 38mm powder  
coated machine screws for  
attaching the metal grille to  
the bafꢀe. (Included with JBL  
Profesional grilles.)  
pcs - #10 x .75 in (19mm) sheet  
metal screw for attaching the  
driver / bafꢀe 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.  
Point Each Corner  
pcs - M4 x 14mm sheet metal  
screw for attaching the driver /  
bafꢀe to the back box. Match to  
corners on back box.  
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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