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 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 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.
CHEVY S-10 REG CAB
Proof of purchase is required when requesting service, so please retain your sales receipt and take
Vehicle Specific Subwoofer Enclosure
Made in the USA
One Mitek Plaza, Winslow, IL. 61089
21A7240
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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.
carpet to the front of vehicle.
5 Open hood.
Drill a hole through the fire wall. Locate a spot low on the fire wall on
the driver’s side. You should always look to find a clear path. Drill a hole
22 Adjust gain and crossover.
from inside of the vehicle into engine compartment and insert grommet.
Setting Gain
Firewall
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.
Drill Hole
for Grommet
Battery
Optional- The EBC, or Electronic Bass Control, allows a remote bass
control to be adjusted from the driver's seat.
Note: To avoid any damage to parts inside engine compartment,
drill from inside of vehicle using a short bit.
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.
7 Route 10ga red power wire through grommet into the engine compart-
ment.
Route 10ga red power wire through engine compartment safely away
from any moving or hot parts that could damage the wire.
9 Cut 10ga red power wire to length, connect the supplied fuse holder
from the wire kit to the end of the wire.
TROUBLESHOOTING TIPS IF AMP DOES NOT TURN ON
Remove 20amp fuse from MTX fuse holder. Connect furnished ring
terminal to positive side of battery. Remove 5/16" bolt from factory battery
terminal. Pass bolt through factory battery terminal, then ring terminal,
and into the other side of factory battery terminal and retighten bolt.
Check all connections at battery and that fuse is installed
Check speaker wire connections
Check ground
Check fuse on pre-amp
Ignition OFF When Disconnecting Battery
23 Reinstall radio by reversing the removal instructions.
Always turn the ignition OFF when connecting or disconnecting battery
(PCM) or other electronic components.
24 Reinstall threshold trim. Locate and align holes in vehicle with pins
on trim; and snap back into place.
Using screws provided, install the enclosure into vehicle as shown
below.
5
2
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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.
Behind the radio, locate the rear speaker wires. Colors are right
channel; 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 over to driver’s side threshold and to pre-amp
of enclosure
SPEAKER WIRES
The best place to find speaker wires is behind the radio.
13 Remove (4) 7mm bolts from trim underneath steering column.
Although, MTX has made every effort to assure proper wiring colors,
MTX is not responsible for any changes made by the vehicle manufac-
turer which sometime occur. If wiring colors do not match then physical
verification is required.
CONNECTION 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
14 Remove (3) bolts holding the instrument cluster trim panel. Pull along
edge to unsnap.
Optional EBC
(Electronic Bass Control)
SOLID
Dark Blue (+)
INPU
T
Light Blue (-)
STRIPED
SOLID
Yellow (-)
Brown (+)
15 Unplug lights and air bag cut off switch on the backside of the trim
panel.
16 Remove (2) bolts holding the radio in the dash.
19 Plug power wire harness into amplifier pre-amp.
20 Replace 20amp fuse under hood.
3
4
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