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CHEVY SUBURBAN
Also fits Yukon & Tahoe
ThunderForm Loaded Enclosures purchased in the United States from an authorized MTX dealer
are guaranteed against defects in material and workmanship for a period of two years from the date
purchased by the end user, and limited to the original retail purchaser of the product.
Amplified ThunderForm Enclosures purchased in the United States from an authorized MTX dealer
are guaranteed against defects in material and workmanship for a period of one year from the date
purchased by the end user, and limited to the original retail purchaser of the product.
Product found to be defective during that period will be repaired or replaced by MTX at no charge.
This warranty is void if it is determined that unauthor ized 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 removal and reinstallation of products are not covered by this warranty. MTX's total
liability will not exceed the purchase price of the product. If a defect is present, your authorized MTX
dealer may be able to effect repairs.
Proof of purchase is required when requesting service, so please retain your sales receipt and take
a moment to register your product online at www.mtx.com.
237
Vehicle Specific Subwoofer Enclosure
Made in the USA
One Mitek Plaza, Winslow, IL. 61089
1-800-225-5689
www.mtx.com
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READ ALL DIRECTIONS CAREFULLY BEFORE BEGINNING
MOUNTING LOCATION:
The enclosure replaces the factory console in
Chevy and GMC Suburban, Yukon, Tahoe, full size Blazer and 1988-
TOOLS REQUIRED FOR INSTALLATION:
6” Ratchet Extension 5/16” Wrench
Wire Crimper Wire Cutters
3/8” Drill Bit
INSTALLATION:
1
Start by removing factory console: open console and remove inner
compartment. Pull drawer on bottom rear of console out. Remove two 10
mm bolts at front of console on floor. Pull console forward towards dash,
this will unclip console at rear. Remove two 10 mm bolts holding rear
bracket to floor.
3
Using factory bolts, bolt down MTX mounting brackets in holes for
factory console (the small bracket in rear and the large bracket in the
front).
Large
Brac
ke
t
Small
Brac
ke
t
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
S
tep
for
mounting directions
.
AMPLIFIED THUNDERFORM
Routing Power Wire; we recommend a connection directly to the
battery.
For technical assistance call 1-800-CALL MTX.
replace a professional installation. As always before screwing or drilling
check to make sure you will not damage any wires or hoses or cause
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
_
_
20 Amp Fuse
Lo
w Le
ve
l Signal
Tu
On Lead
Optional EBC
(Electronic Bass Control)
1
6
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5
bolts holding seat to floor.
Seat
15mm Bol
t
6.
screws and pull up on trim; it will release easily.
7.
8
Using furnished wiring harness route 10ga red power wire starting
at the pre-amp location. Route wire under carpet beneath the driver's
seat, over to threshold and under carpet to the front of vehicle on driver’s
side.
9.
Open hood.
1
0
Drill a hole through the
fire wall
fire wall
You should always look to find a clear path. Drill a hole from inside of the
vehicle into engine compartment and insert grommet.
Firewall
Batter
y
ill Hole
fo
r Grommet
Note: To avoid any damage to parts inside engine compartment,
drill from inside of vehicle using a short bit.
Optional
- The
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
visible” your sub is going to be. Take your time and really listen to your
system, grab a soda and a few of your favorite tunes and have fun.
ROUBLESHOOTING TIPS IF AMP DOES NOT TURN ON
2
2
Mount enclosure in vehicle: align recess in side of enclosure with
brackets installed in
S
tep 3
attach enclosure to brackets. Passenger side front can be reached from
under seat, through window in side of seat rail. Drivers side front is a little
more difficult, but can be done at a slight angle from the front of the driv-
ers seat (or remove seat as in Step
5
). To reach the rear mounting holes,
move seats as far forward as possible and using a T-50 torx, remove
seat belt at floor. Install screws into enclosure through brackets. Reinstall
seat belts.
Large
Brac
ke
t
Small
Brac
2
3.
Bolt seat back in truck by reversing
S
tep
5
2
5
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compartment.
1
2
from any moving or hot parts that could damage the wire.
1
3
Cut 10ga red power wire to length, connect the supplied fuse holder
from the wire kit to the end of the wire.
20
amp fuse from MTX fuse holder. Connect furnished ring
terminal to positive side of battery. Remove nut from factory battery ter-
minal. Pass bolt through factory battery terminal, then ring terminal, and
into the other side of factory battery terminal and retighten nut.
5
Ground amplifier to chassis of vehicle; connect the terminal provided
to the 10ga black wire from furnished wiring harness. A good ground is
as important as the power connection. The ground should be as short as
possible and the contact point should be free of paint and debris.
S
PEAKER WIRES
1
6
located in the smaller of the two wiring harnesses. Colors are right chan-
nel; dark blue (positive) light blue (negative), and left channel; brown
(positive), yellow (negative). Tap into wires
with the supplied RCA High
Level input wires
and route under carpet beneath the seat, over to pre
amp on enclosure. Depending on the option package, there may be
more than one wire in these colors. The speaker wire will be the smallest
wire.
Although, MTX has made every effort to assure proper wiring colors,
MTX is not responsible for any changes made by the vehicle manufac-
C
ONNECTION TO ENCLOSURE
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
PW
RGNDREM
EB
C
INPUT
RIGHTLEFT
GAI
NX-OVER
STATUS
STRIPED
SOLID
SOLID
Dark Blue (+)
Light Blue (-)
Ye
llow (-)
Brown (+)
Optional EBC
(Electronic Bass Control)
1
8
A
IN PUT
X- OVE R
19
20
amp fuse under hood.
2
0
When amp turns on, LED will display red during diagnostic mode and
then to green, signaling amp is on and functioning (amp will only turn on
when radio is on).
2
1
Adjust gain and crossover.
Setting Gain
Turn gain knob on Thunderform pre-amp to minimum, counter clock-
wise. Play a favorite tape or compact disc that contains consistent music
and bass. Turn the source unit to maximum listening level. You should
know that some source units will produce distortion or “clip” before the
unit reaches maximum volume. Reduce volume to the loudest listening
level before distortion. Turn the gain knob on the Thunderform pre-amp
clockwise until the speaker starts to distort and reduce gain to loudest
listening level before distortion.
3
4
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