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READ ALL DIRECTIONS CAREFULLY BEFORE BEGINNING

MOUNTING LOCATION:

 The enclosure mounts firing to the center of the 

vehicle behind the factory spare tire of 1993-1998 Jeep Grand Cherokee, 
except optional aluminum spare that was most predominant in 1996-1997 
model years.

TOOLS REQUIRED FOR INSTALLATION:

 

 

Wire Cutters 

Phillips Head Screwdriver

Terminal Crimpers 

7/16” Nut Driver 

INSTALLATION: 

Follow the steps below

1. 

Remove the spare tire. Unzip the cover. Remove wing nut and washer 

holding spare tire. Place enclosure in location occupied by spare tire.

2. 

If  externally  amplified  make  speaker  connections  to  the  enclosure 

from  the  amplifier;  loosen  terminal  knobs  (a  13-mm  nut  driver  can  be 
used). Connect speaker wires from amplifier to enclosure, positive to red 
terminal knob and negative to black terminal knob. Refer to Step 19 for 
mounting directions.

 

AMPLIFIED THUNDERFORM
Routing  Power Wire;  we  recommend  a  connection  directly  to  the 
battery.

3.

 Remove driver side threshold trim; remove the phillips head screws 

and pull up on trim, it will remove easily.

20.

 Install grill pegs provided into holes in the back of the grill. Start pegs 

into the holes using a 7/16” nut driver over peg and push until base of peg 
is flush with the grill back. Push grill onto enclosure, lining up the holes on 
the enclosure with the pegs and firmly pushing into place.

For technical assistance call 1-800-CALL MTX.

These  instructions  are  guidelines  only  and  in  no  way  are  intended  to 
replace a professional installation. As always before screwing or drilling 
check  to  make  sure  you  will  not  damage  any  wires  or  hoses  or  cause 
damage to the vehicle. 

Warning:

 Batteries normally produce explosive gases which can cause 

personal  injury.  Therefore,  do  not  allow  flames,  sparks  or  lighted  sub-
stances  to  come  near  the  battery.  When  charging  or  working  near  a 
battery,  always  shield  your  face  and  protect  your  eyes.  Always  provide 
ventilation.

Conventional Wiring of Aftermarket Radio

_

+

20 Amp Fuse

Low Level Signal

Turn On Lead

20

A

PW

R

G

N

D

RE

M

EB

C

INPUT

RI

G

H

T

LE

FT

G

AI

N

X-

O

VE

R

ST

AT

U

S

Optional EBC

(Electronic Bass Control)

1

6

Summary of Contents for Thunderform JEEP GRAND CHEROKEE

Page 1: ...ranty is void if it is determined that unauthorized parties have attempted repairs or altera tions of any nature Warranty does not extend to cosmetics or finish Before presuming a defect is present in the product be certain that all related equipment and wiring is functioning properly MTX disclaims any liability for other incurred damages resulting from product defects Any expenses incurred in the...

Page 2: ...Remove driver side threshold trim remove the phillips head screws and pull up on trim it will remove easily 20 Install grill pegs provided into holes in the back of the grill Start pegs into the holes using a 7 16 nut driver over peg and push until base of peg is flush with the grill back Push grill onto enclosure lining up the holes on the enclosure with the pegs and firmly pushing into place For...

Page 3: ...nal The EBC or Electronic Bass Control allows a remote bass control to be adjusted from the driver s seat Setting Crossover You should set the crossover to your own personal listening taste The crossover is adjustable to any frequency between 50Hz counterclock wise to 150Hz clockwise As a guideline the goal is to create the illu sion of bass up front The higher the crossover point the more audibly...

Page 4: ...le manufac turer which sometime occur If wiring colors do not match then physical verification is required CONNECTION TO ENCLOSURE 13 Connect speaker wire RCA s to the inputs of pre amp Note Patented BTL turn on circuitry amplifier senses DC offset provided by high powered or BTL type head units This feature turns the amplifier on automatically if you are using high level inputs _ 20 Amp Fuse 20A ...

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