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
6. Variable 40Hz-200Hz, 24dB Low-Pass X-over – This control allows the user to choose the exact low pass
frequency range the amplifi er will play for the best possible performance. The upper end of the crossover
frequency point can be selected from 40Hz–200Hz at 24dB per octave.
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.
8. Quasi Parametric Equalizer - This one band equalizer provides individual frequency and -/+ 12dB gain
adjustment controls. Any frequency from 30Hz to 80Hz can be chosen and boosted or cut up to 12dB.
9. 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.
10. StreetWires Connectors – All MTX amplifi ers include StreetWires connectors for effi cient current and
maximum voltage transfer.
11. Speaker Connection – Two sets of speaker terminals are provided for dual woofer applications. When
connecting a single woofer, use only one set of speaker terminals.
12. 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
• +12V – The power wire from this connection must be attached to the positive side of the vehicle battery.
• CAP+ - Capacitor Positive Input – The ideal connection point for 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
• Phillips bit or screwdriver
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.
Installation
Mounting
Place your Thunder amplifi er at the predetermined mounting location. Use a felt pen to mark the exact position
of the mounting holes on the mounting surface. Set the amplifi er aside. Then with a sharp, precise blade cut
small circles in the carpet and padding around the four marks denoting your mounting holes to expose the
metal underneath. Use a center punch to make an indentation in the metal to ensure that you drill the exact
Note: Please use common sense and make sure that all vehicle wires, gas lines, brake lines, etc, are clear and will
not interfere with the installation. ALWAYS WEAR PROPER SAFETY GLASSES.
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