User manual JBL Control 328CT

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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.  
IMPORTANT!  
When installing the  
MTC-300BB8 with a  
Control 328C/CT,  
see “Securing Speaker  
Assembly to the Building  
Structure” details below.  
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  
4
pcs - #10 x 0.75 in (19 mm)  
sheet metal screw for attaching  
the bafꢀe / driver to the back  
can. Match to clip nuts on  
back can. (Included with MTC-  
3
00BB8. )  
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.  
4
pcs - M4 x 38 mm powder  
coated machine screws for  
attaching the metal grille to  
the bafꢀe. (Included with JBL  
Professional grilles.)  
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: 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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