11. Remove 20amp fuse from MTX fuse holder. Connect furnished ring terminal
to positive side of battery. Remove 5/16" bolt from factory battery terminal. Place
ring terminal on battery post and retighten nut.
Ignition OFF When Disconnecting Battery
Always turn the ignition OFF when connecting or disconnecting battery cables.
Failing to do so may damage electronic components.
12. 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 damage
any wires, hoses or cause damage to the vehicle.
Factory Speaker Wire Colors
13. In the channel on drivers' side threshold, locate the left and right rear speaker
wires. They maybe also be wrapped in black tape or twisted together. Wire colors
for the left rear speakers are: tan/yellow (positive) and grey/light blue (negative).
Right rear speaker wire colors are: orange/red (positive) and brown/pink (nega-
tive). 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
14. 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 RG N DRE M
EB C
IN P U T
RI G H TLE F T
GAINX-OVER
STATUS
STRIPED
SOLID
SOLID Orange/Red (+)
Brown/Pink (-)
Grey/Light Blue (-)
Tan/Yellow (+)
Optional EBC
(Electronic Bass Control)
15. Plug power wire harness into amplifier pre-amp.
2 0 A
PWRGNDREM
EBC
INPUT
RIGHTLEFT
GAINX-OVER
STATUS
16. Replace 20amp fuse under hood.
17. 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.
18. 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
ThunderForm 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.
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