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 |  JL Audio - C1-400x Owner’s Manual  

WA R N I N G

!!

 

Double check the clearance for both speakers 

before proceeding. Many cars are different from 

one side to the other! 

 

Speaker Installation in Factory Locations: 

Your new speakers have been designed to install, 

without modifications, into most vehicles with 
OEM speaker locations that accept a 4.0-inch (100 
mm) speaker. Many factory 4.0-inch speakers use 
four mounting screws, which will line up with the 
mounting holes on your C1-400x speakers, as shown 
in Diagram A (page 5). Some vehicles may require 
adaptor rings to achieve correct clearances and 
spacing. Consult your JL Audio dealer for details on 
your particular vehicle

In some vehicles, only two mounting holes are 

used when there is insufficient clearance for the 
two unused mounting tabs, as shown in Diagram B 
(page 5). If this is the case, bend the redundant tabs 
back and forth until they break off (all four tabs on 
the C1-400x are perforated for this purpose). After 
breaking off the unwanted tabs, please handle the 
speaker carefully, as the broken edges may be sharp.

It is absolutely vital that the speaker frame fits into 

the mounting hole cleanly. This must be checked prior 
to tightening the screws. Never force the frame into 
a hole that is too small, and do not attempt to tighten 
the speaker onto an uneven surface. This will damage 
your speakers. 

The speaker should fit so that air does not leak 

around the mounting flange. Air leaks will cause a 
severe degradation in sound quality. Seal any air leaks 
with an automotive-grade sealant material. 

WA R N I N G

!!

 

Hand-tighten the screws evenly in a criss-cross 

pattern to avoid bending the speaker frame or 

stripping the mounting screws.

INSTALLATION OVERVIEW

C1 speakers are designed for installation into 

OEM speaker locations, mounted behind factory 
panels/grilles. Depending on the equipment used 
or design of your audio system, you may use the 
factory speaker wires or run new speaker wires to 
each speaker location. You will also need to run new 
speaker wires if you elect to mount your speakers in 
custom locations. Select the wiring method that is 
appropriate for your audio system and equipment. 
If you are unsure about this or any steps in the 
installation process, please contact your JL Audio 
dealer for installation help.

Speaker Wiring:

 

If you will be using the factory speaker wires, it may 

be necessary to change the terminations. This may 
be accomplished by using an adaptor plug or simply 
by cutting the factory connector off and using the 
supplied crimp connectors to terminate the speaker 
wires. The larger connector is for the positive terminal 
and the smaller connector is for the negative terminal 
of each C1-400x. 

If you choose to run new speaker wires, protect all 

wiring from sharp edges by carefully routing them, 
securing them and using grommets and loom where 
appropriate. If you are running wires into a door, use 
existing factory wiring boots whenever possible. If 
you are drilling new holes, file their edges and install 
rubber grommets into each hole. Wires running into 
car doors should be covered with a protective, flexible 
PVC sleeve. Make sure that the wires will clear door 
hinges and other structures in the door. 

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