1. Introduction
This manual provides essential information for the proper installation, operation, and maintenance of your MTX 12" 400 Watt RMS Dual Loaded 1200 Watt Car Subwoofer Enclosure Audio System with Sub Box, Mono Block & 8-Gauge Amplifier Complete Wiring Installation Kit. Please read this manual thoroughly before use to ensure optimal performance and safety.
2. Safety Information
Always observe the following safety precautions to prevent injury or damage to the equipment:
- Ensure all connections are secure and properly insulated to prevent short circuits.
- Disconnect the vehicle's battery before performing any electrical work.
- Install the system in a well-ventilated area to prevent overheating of the amplifier.
- Do not expose the components to moisture or extreme temperatures.
- This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.
- Seek professional assistance if you are unsure about any installation steps.
3. What's in the Box
Verify that all components listed below are present in your package:
- 2 x 12-inch MTX Subwoofers (pre-installed in enclosure)
- Subwoofer Enclosure
- Mono Block Amplifier
- 8-Gauge Amplifier Installation Kit (includes power wire, ground wire, turn-on wire, RCA interconnect cable, speaker wire, fuse holder, terminals, wire ties, rubber grommets)
- Bluetooth Connectivity Module (if applicable)
- Light Bar (if applicable)

Image: The complete MTX car audio system, including the dual 12-inch subwoofer enclosure, mono block amplifier, and the comprehensive 8-gauge wiring installation kit.

Image: A detailed view of the Soundstorm 8-gauge amplifier installation kit, showing various wires, terminals, and the fuse holder necessary for connecting the amplifier.
4. Setup and Installation
Proper installation is crucial for optimal performance. Follow these general steps:
- Planning: Determine the best location for the subwoofer enclosure and amplifier in your vehicle. Consider space, ventilation, and cable routing. The subwoofer enclosure dimensions are approximately 13.79"D x 29.63"W x 13.79"H.
- Power Wiring: Connect the 8-gauge red power wire from the amplifier to the vehicle's battery (via the fuse holder). Ensure the fuse holder is installed close to the battery.
- Ground Wiring: Connect the 8-gauge black ground wire from the amplifier to a clean, unpainted metal surface on the vehicle's chassis.
- Remote Turn-On: Connect the 18-gauge blue turn-on wire from the amplifier to the remote turn-on output of your car stereo.
- RCA Interconnect: Connect the RCA interconnect cable from your car stereo's pre-amp outputs to the amplifier's RCA inputs.
- Speaker Wiring: Connect the speaker wire from the amplifier's speaker outputs to the subwoofer enclosure's input terminals. Ensure correct polarity.
- Final Checks: Double-check all connections for security and proper insulation before reconnecting the vehicle's battery.

Image: An illustration showing the dimensions of the MTX subwoofer enclosure and the mono block amplifier, aiding in planning the installation space within a vehicle.

Image: The MTX dual 12-inch subwoofer enclosure neatly installed in the trunk of a car, demonstrating a typical setup.

Image: A close-up view of the MTX amplifier's connection terminals, including power, ground, remote, and speaker outputs, essential for proper wiring.
5. Operating Instructions
Once installed, your MTX audio system is ready for use. Ensure your car stereo is properly configured to send audio signals to the amplifier.
- Power On: The amplifier will power on automatically when your car stereo is turned on, provided the remote turn-on wire is correctly connected.
- Adjusting Gain: Carefully adjust the gain control on the amplifier to match the output voltage of your car stereo. Start with the gain at minimum and slowly increase it until the desired volume is achieved without distortion.
- Bass Control: Use the included remote bass control (if applicable) to adjust the subwoofer's output level conveniently from the driver's seat.
- Bluetooth Connectivity: If your system includes Bluetooth connectivity, pair your mobile device with the system to stream audio wirelessly. Refer to your car stereo's manual for specific pairing instructions.

Image: The front view of the MTX dual 12-inch subwoofer enclosure, showcasing the two subwoofers and the "Terminator" branding.

Image: The MTX remote bass control knob, allowing for convenient adjustment of subwoofer output from the vehicle's cabin.
6. Maintenance
To ensure the longevity and optimal performance of your MTX audio system, follow these simple maintenance guidelines:
- Keep the subwoofer enclosure and amplifier clean and free of dust and debris. Use a soft, dry cloth for cleaning.
- Periodically check all wiring connections to ensure they remain secure and free from corrosion.
- Avoid placing heavy objects on the subwoofer enclosure or amplifier.
- Ensure adequate ventilation around the amplifier to prevent overheating.
7. Troubleshooting
If you encounter issues with your MTX audio system, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No Sound from Subwoofer |
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| Distorted Sound |
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| Amplifier Overheating |
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8. Specifications
| Feature | Detail |
|---|---|
| Model Name | TNP212D2 |
| Speaker Type | Subwoofer |
| Subwoofer Diameter | 12 Inches (x2) |
| Impedance | 4 Ohm |
| Speaker Maximum Output Power | 1200 Watts |
| Product Dimensions (Enclosure) | 13.79"D x 29.63"W x 13.79"H |
| Connectivity Technology | RCA, Wired (Subwoofer), Bluetooth (if applicable) |
| Audio Output Mode | Mono |
| Control Method | Touch (via remote bass control) |
| Manufacturer | MTX |
| Item Model Number | TNP212D2-8GK |
| UPC | 715442111862 |
9. Warranty and Support
Your MTX audio system comes with a Limited Warranty. For specific details regarding warranty coverage, terms, and conditions, please refer to the warranty card included with your product or visit the official MTX website.
For technical support, troubleshooting assistance beyond what is provided in this manual, or warranty claims, please contact MTX customer service. Contact information can typically be found on the MTX website or on your product packaging.





