MTX Thunderform F250X00 Directions

FORD F-250/F-350 SUPER CAB

Warranty Statement

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 deter mined 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 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 mtx.com.

21A8124

Vehicle Specific Subwoofer Enclosure

Made in the USA

One Mitek Plaza, Winslow, IL. 61089

1-800-225-5689 mtx.com

READ ALL DIRECTIONS CAREFULLY BEFORE BEGINNING

MOUNTING LOCATION: The enclosure mounts under the rear

seat, firing up,

in Ford F-250/F-350 Super Cab Trucks.

TOOLS REQUIRED FOR INSTALLATION:

Powered Screwdriver #2 Phillips Head Bit

Wire Cutters 5/16” Wrench

6" Bit Holder Extension

INSTALLATION: Follow the steps below

1. Slide front seats to full forward position and fold up rear seats. This will give

you more room to work with.

2. Remove jack tools from floor and set them aside (you will reinstall them later in

Step 23). The jack does not need to be removed and stays in factory location.

3. You may want someone to help you for this step. Lift enclosure into your truck

and place it on the floor behind the front seats with the woofers facing up.

4. If externally amplified, make speaker connections to the enclosure from the

amplifier. Connect speaker wires from amplifier to enclosure, positive to red ter

-

minal and negative to black terminal.

AMPLIFIED THUNDER

FORM

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

5. Remove drivers side and passenger side threshold trim; pull up on trim, it will

remove easily.

6. Using furnished wiring harness route 10ga red power wire starting at pre-amp

location. Route wire on driver

s side, over to threshold and under carpet to the

front of vehicle.

Conventional Wiring of Aftermarket Radi

o

_

+

20 Amp Fuse

Low Level Signal

Turn On Lead

20A

PWRGNDREM

EB

C

INPUT

RIGHTLEFT

GAINX-OVE

R

STATUS

Optional EBC

(Electronic Bass Control)

1 6

7. Open hood.

Firewall

Battery

Drill Hole
fo

r Grommet

8. Drill a hole through the fire wall. Locate a spot low on the fire wall on the pas­senger side. You should always look to find a clear path. Drill a hole from inside
of the vehicle into engine compartment and insert grommet. You may also find a
pre-existing, unused rubber grommet in this location that you can pass the wire
through.

Note: To avoid any damage to parts inside engine compartment, drill from
inside of vehicle using a short bit.

9. Route 10ga red power wire through a grommet into the engine compartment.

10. Route 10ga red power wire through engine compartment safely away from

any moving or hot parts that could damage the wire.

11. Cut 10ga red power wire to length, connect the supplied fuse holder from the
wire kit to the end of the wire.

12. Remove 20amp fuse from MTX fuse holder. Connect furnished ring terminal
to positive side of battery. Remove 5/16" bolt from factory battery terminal. P

lace

ring terminal on battery post and retighten nut.

20. Reinstall threshold trim. Locate and align holes in vehicle with pins on trim;

and snap back into place.

21. Place the drivers side of enclosure in first, so it fits into the seat bracket.

Then slide the passenger side, so the enclosure is tight against the seat bottom.

22. Using the supplied hardware, secure the enclosure to floor of vehicle as

shown below.

23. Slide jack tools into center compartment under enclosure.

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 substances to come near
the battery. When charging or working near a battery, always shield your face and
protect your eyes. Always provide ventilation.

25

Ignition OFF When Disconnecting Battery

Always turn the ignition OFF when connecting or disconnecting battery cables.

Failing to do so may damage electronic components.

13. 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.

As always, before screwing or drilling check to make sure you will not dam

age

any wires, hoses or cause damage to the vehicle.

Factory Speaker Wire Colors

14. In the channel on drivers' side threshold, locate the left rear speaker wires

wrapped in black tape. Wire colors for the left rear speakers are: tan/yellow (posi

­tive) and grey/light blue (negative). In channel on the passenger side threshold,
locate the right rear speaker wires. Right rear speaker wire colors are: orange/red
(positive) and brown/pink (negative). Tap into wires with the supplied RCA High
Level input wires and route over to passenger side threshold and to pre-amp of
enclosure

Although, MTX has made every effort to assure proper wiring colors, MTX is not
responsible for any changes made by the vehicle manufacturer which sometime
occur. If wiring colors do not match then physical verification is required.

CONNECTION TO ENCLOSURE

15. 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

EBC

INPUT

RIGHTLEFT

GAI

NX-OVER

STATUS

STRIPED

SOLID

SOLID

Orange/Red (+)

Brown/Pink (-)

Grey/Light Blue (-)

Tan/Yellow (+)

Optional EB

C

(Electronic Bass Control)

16. Plug power wire harness into amplifier pre-amp.

20 A

PW

RGN DRE M

EB

C

IN PUT

RI GHTLE FT

GA I

NX- OVE R

ST ATU S

17. Replace 20amp fuse under hood.

18. When amp turns on, LED will display red during diagnostic mode, and then

green, signaling amp is on and functioning. Amp will only turn on when radio is
on.

19. Adjust gain and crossover.

Setting Gain

Turn gain knob on

Thunderform pre-amp to minimum, counter clockwise. Play
a favorite tape or compact disc that contains consistent music and bass. Turn
the source unit to maximum listening level. You may want to turn down the bass
slightly on the source unit. 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

Thundeform
pre-amp clockwise until the speaker starts to distort and reduce gain to loudest
listening level before distortion.

Optional- 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 cross

­over is adjustable to any frequency between 50Hz (counterclockwise) to 150Hz
(clockwise). As a guideline, the goal is to create the illusion 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.

TROUBLESHOOTING TIPS IF AMP DOES NOT TURN ON

Check all connections at battery and that fuse is installed

Check speaker wire connections

Check ground

Check fuse on pre-amp

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