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4. Input Sensitivity – The Input Sensitivity switch is used to set the proper input voltage range:
X1 POSITION: 100mV–1V (Typically for RCA Input)
X10 POSITION: 1V–10V (Typically for Speaker Level Input)
5. Gain Control – This feature is used to fi ne-tune the input sensitivity of the amplifi er to the source unit’s output
level.
6. Variable Hi, 12dB / Low, 24dB Mono @ 40Hz–350Hz X-over – This control allows the user to choose the exact
low pass or high pass frequency range the amplifi er will play for the best possible performance. The upper
end of the low pass crossover range can be selected from 40Hz–350Hz at 24dB per octave with a mono output.
The lower end of the high pass crossover range can be selected from 40Hz-350Hz at 12dB per octave with a
stereo output.
7. Fixed Subsonic Filter – This feature limits frequencies from 30Hz at 12dB per octave and below from being
sent to the subwoofers. The subsonic feature includes a selectable on/off switch and a control knob used to
adjust.
8. Parametric Equalizer – This one band parametric equalizer provides individual frequency, Q/bandwidth, and
-/+ 12dB gain adjustment controls. Any frequency from 30Hz to 80Hz can be chosen and boosted or cut 12dB.
The “Q” ranges from 0.5 to 4.0 in value allowing a wide variety of bandwidth adjustment to address the subtle
tuning requirements common to mobile audio systems.
9. A.R.C. – The Active Resonance Control (A.R.C.) is a level adjustment that reduces the resonant frequencies
inside the vehicle to improve the midrange sound quality. Turn this control in either direction until the vocals
of the music are up front and centered in the vehicle. The midrange sound should be smooth and detailed.
10. Remote Subwoofer Level Control (Remote Gain) – This port allows the use of the optional “remote level
control”. The Remote Subwoofer Level Control is a bass control module that can be installed in any location
within the vehicle for remote adjustments.
11. StreetWires Connectors – All MTX amplifi ers include StreetWires connectors for effi cient current and
maximum voltage transfer.
12. Speaker Connection – These output terminals are individually labeled for proper speaker connections. When
bridging the amplifi er, use the left positive terminal and the right negative terminal only. Warning, do not
bridge the amplifi er with an impedance lower than 2 ohms.
13. Power Terminals – This is the main power connection for the amplifi er. The power and ground wire size
should be the same gauge.
• GND – The ground wire from this connection must be attached to bare metal on the vehicle. The distance to
the ground should be as short as possible and no more than 18”.
• REM – To turn the amplifi er on/off, this terminal must be connected to the source unit’s “remote or electric
antenna” wire.
• +12V – The power wire from this connection must be attached to the positive side of the vehicle’s battery.
• CAP+ - Capacitor Positive Input – The ideal connection point ofr the positive side of the capacitor to increase
the amplifi er’s performance.
• CAP- - Capacitor Negative Input - The ideal connection point for the negative side of the capacitor to increase
the amplifi er’s performance.
Before Starting
MTX recommends that you have your new Thunder amplifi ers installed by an authorized MTX retailer, preferably
MECP certifi ed. If you do decide to do it yourself, make sure you have read the instructions carefully and have
the following tools:
• Electric drill
• Phillips bit or screwdriver
• 1/8” bit
• Wire cutters/crimpers
• Safety glasses
• X-Acto knife
Disconnect the vehicle’s negative battery connection. Any deviation from the recommended connection
procedures may cause serious damage to the amplifi er, speakers, and/or vehicle electrical system. Please
double check the connections before turning the system on.