JBL Control 321C Manuale utente

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 –

23

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™

Attaching the loudspeaker/bafe securely in place with screws:

Using JBL’s MTC-300BB12 Backbox – MTC-300BB12 is compatible with two common mounting systems for in-

stalling the loudspeaker/bafe to the backbox. Either of these mounting systems may be utilized. Screws are included

with the MTC-300BB12 backbox.

Using A Different-Brand Compatible Backbox -- Screwholes in the metal bafe are provided corresponding with

two common mounting systems. Utilize the system that works with that particular backbox.

Mounting Option #2

Using 4 pcs 4 mm Machine Bolts

2 Points at Each Side

1 Point at Each End

Mounting Option #1

Using 6 pcs #10 Sheet Metal Screws

1 Point at Each Corner

4 pcs 4 mm x 14 mm

Threaded Machine Bolts

(included with JBL MTC-300BB12 backbox).

Use with Backbox’s 4 Threaded

Insert Points, shown above.

6 pcs #10 x 0.75 inch

Sheet Metal Screws

(included with JBL MTC-300BB12 backbox)

Use with Backbox’s 6 Speed Nuts (also called Clip Nuts or

Tinnerman Nuts), shown above.

4

JBL Professional

8500 Balboa Boulevard, P.O. Box 2200

Northridge, California 91329 U.S.A.

361089-001

8/05

MTC-300BB12

Backbox Shown

– OR –

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