MTX Audio Car Speaker THUNDERFORM User Manual

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  
GMC Sonoma/Isuzu Hombre  
Vehicle Specific Subwoofer Enclosure  
Made in the USA  
One Mitek Plaza, Winslow, IL. 61089  
21A7240  
 
21.
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.  
6.
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.  
8.
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  
10.
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  
cables. Failing to do so may damage the Power train Control Module  
(PCM) or other electronic components.  
24 Reinstall threshold trim. Locate and align holes in vehicle with pins  
on trim; and snap back into place.  
25.
Using screws provided, install the enclosure into vehicle as shown  
below.  
5
2
 
11.
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.  
17.
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  
12.
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  
18.
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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