MTX Audio Stereo Amplifier TA7402 User Manual

TA7402 Owners Manual  
Introduction  
Thank you for choosing MTX to help reach the ultimate goal with your vehicle. Adding MTX amplifiers and  
matching MTX speakers and subwoofers with StreetWires connections will put you in a better position to  
hear, feel, and experience all of the music the artist intended.  
Specifications  
Primary Ratings:  
Power Output: 100 watts RMS x 2-channels at 4 ohm and 1% THD+N  
Signal-to-Noise Ratio (1 watt): 75dB  
Secondary Ratings:  
Power Output: 200 watts RMS x 2-channels at 2 ohm and 1% THD+N  
Power Output: 300 watts RMS x 2-channels at 1 ohm and 1% THD+N  
Power Output: 400 watts RMS x 1 bridged at 4 ohm and 1% THD+N  
Power Output: 600 watts RMS x 1 bridged at 2 ohm and 1% THD+N  
THD+Noise (Distortion) (1 watt): .1%  
Frequency Response (-3dB): 20Hz-20kHz  
Maximum Input Signal: 10V  
Maximum Sensitivity: 100mV  
Dimensions: 9-5/8” x 20-11/16” x 2-1/2” (245mm x 525mm x 65mm)  
Smart Engage™ Auto-Turn-On (Patent No: US06556683)  
Patented Pure N-Channel Technology (Patent No: US05631608, US05783970)  
Patented Power Supply (US05598325)  
Input Sensitivity Switch: 100mV-1V/1V-10V  
Crossover: Hi, 12dB / Low, 24dB Mono @ 40Hz-350Hz, Defeat  
Quasi Parametric EQ: Boost/Cut +/-12dB, Freq. 30Hz-80Hz  
ARC: Cut 0-15dB, Freq. 200Hz  
Remote Subwoofer Level Control  
Features  
1. Prizm EFX – All MTX amplifiers include backlit adjustment controls on the top surface of the product.  
Color – The backlit controls offer unlimited colors on the display -- from RED, GREEN, and BLUE to any  
color in between.  
EFX – You can switch Prizm EFX lighting to “pulsate” with the beat of the music.  
2. Xtant Technology Cooling (XTC) – A thermal-regulated turbo-charged intercooler supplies fan forced cool air  
evenly and constantly through tightly packed bonded fins. Fan speed is continuously variable and controlled  
by the amplifier’s output, temperature of heatsink, and transformers. Exhaust from the internal heatsink is  
strategically positioned to cool the transformers to maintain maximum performance at all volumes.  
3. Bi-Level Inputs with Smart Engage™ – All MTX amplifiers feature RCA type input connections. All MTX  
amplifiers allow both high level and line level input into the RCA type input connections.  
Low Level Input – Source units with an output signal level of 100mV–10V may be used. See “Input  
Sensitivity” for proper voltage level setting.  
High Level Inputs with Smart Engage™ – All MTX amplifiers allow high level inputs through RCA type  
input connections using provided high level adapters. Source units with an output signal level of 100mV–10V  
may be used. See “Input Sensitivity” for proper voltage level setting.  
Smart-Engage™ Auto-Turn-On - An auto-turn-on circuit is included within the amplifier. A remote turn-  
on wire is not necessary when connecting the amplifier’s high-level input to a high-powered source unit (car  
stereo). The amplifier will automatically turn on when music is received through this type of connection.  
 
Installation  
Mounting  
Place your Thunder amplifier at the predetermined mounting location. Use a felt pen to mark the exact position  
of the mounting holes on the mounting surface. Set the amplifier 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  
position for the screws.  
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.  
Connections  
1. Bi-Level Inputs (Low/High Level Input) with Smart Engage™ – Both a low and high level signal can be used.  
Be sure to lay the signal wire away from all power cables and vehicle computers. Use high quality twisted pair  
interconnect cables to decrease the possibility of radiated noise entering the system.  
Using RCA Connections: If the source unit has RCA outputs, simply attach a signal cable from the source unit  
to the amp’s RCA input. This will provide signal to the amp.  
Using Speaker Level Connections: If the source unit does not have RCA outputs, a high level signal can be  
used instead by taking the supplied high level RCA adapter cables and connecting the bare wire ends to the  
vehicle’s rear speaker wiring. Connect the left negative speaker wire to the green with black stripe wire on the  
supplied high level RCA adapter. Connect the left positive speaker wire to the solid green wire. Do the same  
for the right speaker connection using the purple wire. Now plug the RCA connectors into the amp’s inputs.  
2. Speaker Wire Connections – When installing the speaker wires, please take proper measures to protect them.  
For example, when connecting the door speakers, the speaker wire should run from the amplifier’s output  
terminals, under the carpet, and through the factory rubber boot (loom) that protects the wires in the inner  
door jam. If the factory boot cannot be used, take other measures to protect these wires. Sometimes the door  
has to be completely removed to use the factory boot. If this is something that you do not feel comfortable  
doing, please ask a professional to help you.  
When connecting the speaker wires to the amplifier, please observe the printed polarity markings on the  
amplifier’s StreetWires connector. Failing to wire the speakers in proper phase could result in a loss of bass  
response or poor overall sound quality.  
These amps will have four speaker terminals: left positive, left negative, right positive, and right negative.  
Stereo (2-channel) Connection- This configuration is typically used with full range or high frequency  
speakers. Each channel can drive a minimum of a 1 ohm load.  
Bridged (1-channel) Connection- This configuration is typically used with subwoofers. Both channels  
combined can drive a minimum of a 2 ohm mono load for max power.  
Note: Please pay attention and make sure the speakers or woofers are the correct IMPEDANCE (OHMS) BEFORE  
attaching to the amplifier.  
3. Power Terminals – Please take proper measures during installation to protect the power wires as best you  
can. For example, when running the power cable from the vehicle’s battery through the firewall, use a firewall  
bushing for protection. Run the power wire through the interior of the vehicle, under the carpet, and to the  
amplifier. If this is something that you do not feel comfortable doing, please ask a professional to help you. Be  
sure to lay the power wire away from all signal cables.  
When connecting the power wires to the amplifier, please observe the printed markings on the amplifier’s  
StreetWires power connector. Failing to wire the power cables properly could result in amplifier damage.  
+12V: This is the main power input for the amplifier and must be connected directly to the positive  
terminal of the car battery for the amplifier to operate properly. It is important that a main fuse is installed a  
maximum of 18” from the battery.  
GND: This is the ground connection for the amplifier and must be connected directly to the metal chassis  
of the vehicle for the amplifier to operate properly. A properly grounded amplifier can be run harder and  
longer than a poorly grounded amplifier. The ground on the amplifier should be as short as possible and  
be connected directly to the vehicle’s metal chassis. Do not connect to factory bolts of ANY kind. When  
attaching the ground to the chassis, sand all the paint away from the contact point. A grounding block like the  
StreetWires GT4 should be used whenever possible as this piece of equipment has 5 times the surface area of  
a normal screw.  
 
The gauge of the power and ground wire is often an overlooked aspect of amplifier installation. The more  
power the amplifier receives, the more power it will produce. Power cables have a natural resistance, and  
will lose voltage by the time the power makes its way to the amplifier. The larger gauge (diameter) wire will  
hold more voltage over longer runs. Also, by having a larger diameter ground wire, the amplifier can run  
more efficiently. MTX recommends using a minimum of 4 gauge power and ground cables to get the best  
performance.  
REM: This connection turns the amplifier on and off and needs to be connected to a remote turn-on wire  
from your source unit if you are using a low level input connection.  
Note: When numerous amplifiers are used in the same system, look into using a relay with a separate power wire  
connected to an alternative power source to take the strain off the source unit. Normal source units can only  
keep a constant 12 volts to 2 or possibly 3 amps. This wire should also be run away from the RCA cables.  
CAP+: This 8 gauge terminal is internally wired in parallel with the +12V on the StreetWires Power  
connector. It is the ideal connection point for the positive side of a capacitor to increase the amplifier’s  
performance.  
CAP-: This 8 gauge terminal is internally wired in parallel with the GND on the StreetWires Power  
connector. It is the ideal connection point for the negative side of the capacitor to increase the amplifier’s  
performance.  
Double check all the previous connection installation steps, in particular the speaker and power wiring.  
Securely mount the amplifier. If everything is in order, reconnect the vehicle’s negative battery connection and  
begin following the feature setup and adjustment steps.  
Feature Setup and Adjustments  
1. Selecting the Input Sensitivity Range – Before you turn on your system, you must select the proper input  
sensitivity range on your amp using the button labeled INPUT SENS located in the GAIN CONTROL section of  
the control panel.  
Setting for Aftermarket Source Units: Refer to your aftermarket owner’s manual for line level output  
specification. If the specification is not available, please follow the instructions listed below.  
X1 POSITION: 100mV–1V (Typically for RCA Input)  
Setting for Factory (OEM) Source Units: To check the amount of voltage that is present from the source  
unit, take a multi meter, or a volt/ohm meter, on the AC setting, (range from 100mV up to 10V) attach the  
positive and negative leads directly to any exposed speaker. It will not matter if the polarity is correct, it will  
read the same amount of voltage.  
X10 POSITION: 1V–10V (Typically for Speaker Level Input)  
Note: It is important not to have the amp set up to receive a low voltage signal and give it a high voltage signal.  
Doing this can cause damage to the amp.  
2. Adjusting the Gain Control – Before you start setting your amp gains, be sure to defeat all EQs (“off” position).  
You want to set the gain levels properly BEFORE applying any equalization.  
Start with the source unit’s volume around ¾ of the way up, and the gain on the amp all the way down  
(counter-clockwise). Slowly increase the gain clockwise until the speaker starts to distort. Immediately  
decrease gain until the distortion goes away. This will be a good reference point on the volume control to  
where the signal starts to distort. Remember every CD will be different; use common sense and constantly  
listen for obvious distortion and adjust volume the accordingly. The gain on the amp has nothing to do with  
how much power the amp can produce, just how fast the amp puts out max power. Just like in an automobile,  
full throttle is very rarely needed.  
3. Adjusting the Hi, 12dB / Low, 24dB Mono @ 40Hz–350Hz Variable X-over Frequency Controls –  
Setting for Subwoofers: First enable the electronic crossover by selecting the “ON” position of the X-  
OVER switch, and then select the “L-PASS” (low pass) position on the L-PASS/H-PASS switch. Next, using  
“L-PASS FREQ” you have control over what frequency you want your amp to start crossing over your signal.  
By turning this control all the way counter-clockwise you are crossing the signal over at 40Hz (the range is  
counter-clockwise 40Hz to clockwise 350Hz). This means that the amp will send the woofers frequencies from  
20Hz to 40Hz and then start to taper down as the frequencies go over 40Hz (24dB/octave roll off). The industry  
 
standard for low pass crossover point is right around 90Hz. However, by experimenting with the crossover  
point (higher or lower) you will find what sounds best in this install. This amp uses a 24 decibel per octave roll  
off, which is pretty steep, or tapers off fairly quickly from the crossover point. This design complements both  
the subwoofer and the mid to provide greater musical detail.  
Setting for Components and Separates: First enable the electronic crossover by selecting the “ON”  
position of the X-OVER switch, and then select the “H-PASS” (high pass) position on the L-PASS/H-PASS  
switch. Next, using “H-PASS FREQ” you have control over what frequency you want your amp to start  
crossing over your signal. By turning this control all the way counter-clockwise you are crossing the signal  
over at 40Hz (the range is counter-clockwise 40Hz to clockwise 350Hz). This means that the amp will send the  
components or separates frequencies from 40Hz to 20kHz and then start to taper down as the frequencies go  
over 40Hz (octave roll off). The industry standard for high pass setting or X-over point is around 120Hz. When  
the amp is in HP setting and the X-over point is set to 120Hz, this means the amp is sending the speaker’s  
120Hz–20kHz. This crossover network allows the drivers to recreate the frequencies within a precisely  
designed range so that the speakers do not become distorted by trying to reproduce frequencies that they  
are physically unable to reproduce. This feature ensures that the components or separates do not receive low  
bass notes. The 12dB/oct means the slope, or the amount of other frequencies that will be affected, is fairly  
narrow. This design complements both the subwoofer and the mid and to provide greater musical detail.  
Setting for Full Range (No Crossover): To disable the electronic crossover, select the “OFF” position of the  
X-OVER switch. This setting will allow the amplifier to play all frequencies.  
4. Adjusting the Quasi Parametric Equalizer – In some applications, the bass amplifier needs some help in  
boosting or cutting certain frequencies. A quasi parametric equalizer is distinguished from a parametric  
equalizer in that it allows the user to control only the level and the center frequency of the boost or cut but not  
the “Q”.  
The following steps describe what the two controls of the parametric Bass EQ do in isolation. It is important to  
understand these behaviors, because they must all be considered when setting up the Bass EQ.  
Setting the Frequency: Begin listening for the loudest musical spot or range within the bass range of your  
sound system. Adjust the center frequency to match this point. For most systems, the best center frequency  
adjustment will be between 40-50Hz. Use 45Hz (12 o’clock setting) as a starting point and adjust up or down  
gradually.  
Setting the Boost/Cut: Once you have determined the loudest musical spot or range within the bass range  
of your sound system, start cutting until the response is smooth and even. You can also boost low spots  
within the musical range, but don’t go crazy with the boost knob. There is a lot of boost available, 12dB, but  
begin with a low boost setting (around 3dB) and try to stay below 6dB whenever possible. Remember that for  
every 3dB of additional boost you dial in, you are asking the amplifier to double its power output for a given  
signal in the boost region.  
5. Adjusting the Active Resonance Control (A.R.C.) Feature – This feature will be needed when mounting  
speakers lower in the door or in kick panels. Most vehicles have a natural peak that occurs at about 200Hz.  
By turning the Pot located on the top control panel clockwise you CUT 200Hz up to 15dB. This allows you to  
remove unwanted peaks in your mids and highs that occur in most vehicles.  
6. Remote Subwoofer Level Control (Remote Gain) – Let’s say the amplifier’s gain is set at halfway. When the  
remote subwoofer level control is plugged in, you have external control of the gain from zero to halfway. The  
installation of this level control is NOT necessary to get full power from the amplifier.  
Note: One Remote Subwoofer Level Control can control two or more amplifiers using a mini plug Y-adapter.  
7. Prizm EFX – Now that you have completed adjusting all your amplifier settings, you can set the lighting effects  
to your personal taste.  
Selecting Colors: You can change the backlit colors simply by turning the dial labeled PRIZM COLOR,  
located in the MTX PRIZM EFX section of the control panel, left or right. Starting at the left most position, the  
colors range from RED to GREEN, BLUE, and then RED again. You can choose any color in between making  
the combinations unlimited.  
Selecting the EFX Feature: You can switch Prizm EFX lighting to “pulsate” with the beat of the music.  
Simply depress the button labeled PRIZM EFX located in the in the MTX PRIZM EFX section of the control  
panel to turn this feature on or off.  
 
Trouble Shooting  
Read this if you want to be a do-it-yourselfer or give us a call at 800-CALLMTX.  
PROBLEM  
CAUSE  
SOLUTION  
No LED indication  
No +12V at remote connection  
No +12V at Power connection  
Insufficient ground connection  
Blown power fuse  
Supply +12V to terminal  
Supply +12V to terminal  
Verify ground connection  
Replace fuse  
LED on, no output  
Volume on head unit off  
Speaker connections not made  
Gain control on amplifier off  
Signal processing units off  
All speakers blown  
Increase volume on head unit  
Make speaker connections  
Turn up gain  
Apply power to signal processor  
Replace speakers  
Output distorted  
Balance reversed  
Bass is weak  
Head unit volume set too high  
Amplifier gain set too high  
Lower head unit volume  
Lower amplifier gain  
Speakers wired L + R reversed  
RCA inputs reversed  
Wire speakers with correct orientation  
Reverse RCA input  
Speakers wired out  
phase  
Not using MTX woofers  
Wire with correct of phase  
Buy MTX woofers  
Blowing fuses  
Excessive output levels  
Amplifier defective  
Lower volume  
Return for service  
 

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