JBL Control 321C

Control 321C/CT & 322C/CT
Installation Instructions
MTC-300BB12 Backbox
Shown as Cut-Away for Clarity
1
Line up EZ-Rail™ with one of the
the backbox anges containing a sin-
gle mounting hole. For orientation
when holding the speaker overhead,
two embossed arrows on the under-
side of the metal bafe indicate the
edge with the EZ-Rail.
Slide EZ-Rail onto the ange of the
JBL MTC-300BB12 (or compatible
other brand) backbox.
– Over –
2
3
EZ-Rail helps to hold one side of
the speaker bafe TEMPORAR-
ILY during installation while the
installer installs the screws that hold
the bafe.
IMPORTANT
The installer MUST secure the
bafe in place with screws on all
sides.
Loudspeaker
Pre-Mounted
Metal Bafe
EZ-Rail
™

JBL Control 321C Specifications

General

Brand	JBL
Model	Control 321C
Category	Speakers
Language	English

Summary

Control Speaker Installation

EZ-Rail Mounting System

Guide to aligning and sliding the EZ-Rail onto the backbox flange for initial speaker baffle positioning.

Secure Speaker Baffle

Loudspeaker Mounting Hardware

Details on two mounting options using sheet metal screws or machine bolts to secure the baffle to the backbox.