Before Starting

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 ﬁne-tune the input sensitivity of the ampliﬁer 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 ampliﬁer 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 ampliﬁers include StreetWires connectors for efﬁcient current and maximum voltage transfer.

12.Speaker Connection – These output terminals are individually labeled for proper speaker connections. When bridging the ampliﬁer, use the left positive terminal and the right negative terminal only. Warning, do not bridge the ampliﬁer with an impedance lower than 2 ohms.

13.Power Terminals – This is the main power connection for the ampliﬁer. 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 ampliﬁer 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 ampliﬁer’s performance.

•CAP- - Capacitor Negative Input - The ideal connection point for the negative side of the capacitor to increase the ampliﬁer’s performance.

MTX recommends that you have your new Thunder ampliﬁers installed by an authorized MTX retailer, preferably MECP certiﬁed. 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 ampliﬁer, speakers, and/or vehicle electrical system. Please double check the connections before turning the system on.