1. Product Overview
The MTX Audio Thunderform CXP20UT is an unloaded, custom-fit subwoofer enclosure designed to integrate seamlessly into specific vehicle models. This enclosure allows for the installation of two 10-inch subwoofers (sold separately) to enhance your vehicle's audio system without compromising interior space.
Key Features:
- Designed for 1999-2006 Chevrolet Silverado Extra Cab and GMC Sierra Extra Cab models.
- Also compatible with 1999-2001 GMC Pick-ups with a 3rd door.
- Mounts discreetly under the rear seat, preserving legroom and not disturbing the factory jack kit.
- Accommodates two 10-inch subwoofers (not included).
- Durable construction with a custom fit and tan color matching factory interiors.
Image 1.1: The MTX Audio Thunderform CXP20UT unloaded dual 10-inch subwoofer enclosure in tan. This image shows the top-down view of the enclosure, highlighting the two openings for subwoofers and the central mounting area.
2. Vehicle Compatibility
This Thunderform enclosure is specifically engineered for the following vehicles:
- Chevrolet Silverado Extra Cab: 1999-2006
- GMC Sierra Extra Cab: 1999-2006
- GMC Pick-ups with 3rd door: 1999-2001
Important: Ensure your vehicle matches these specifications for proper fitment. This enclosure is designed for specific models and may not fit other vehicle configurations.
3. Installation Guide
Before beginning installation, ensure you have all necessary tools and the two 10-inch subwoofers you intend to install. Mounting hardware is included with the enclosure.
3.1. Required Components (Not Included)
- Two (2) 10-inch subwoofers
- Appropriate amplifier for subwoofers
- Wiring kit (power, ground, remote turn-on, speaker wire)
3.2. Installation Steps
- Prepare the Vehicle: Ensure the vehicle is turned off and the battery's negative terminal is disconnected for safety. Clear the area under the rear seat where the enclosure will be mounted.
- Install Subwoofers into Enclosure: Carefully mount your two 10-inch subwoofers into the designated openings on the Thunderform enclosure. Secure them using the provided screws or hardware that came with your subwoofers. Ensure a tight seal.
- Wire the Subwoofers: Connect the speaker wires from your subwoofers to the terminal cup on the enclosure. Pay close attention to polarity (+ to + and - to -). If wiring in series or parallel, follow the instructions provided with your subwoofers and amplifier.
- Position the Enclosure: Carefully slide the loaded enclosure under the rear seat of your vehicle. The design ensures it fits without obstructing legroom or the factory jack kit.
- Secure the Enclosure: Use the included mounting hardware to firmly secure the enclosure to the vehicle's floor or seat frame. Refer to the specific instructions provided with the mounting hardware for your vehicle model.
- Connect to Amplifier: Route the speaker wires from the enclosure to your amplifier. Connect the amplifier to your vehicle's power, ground, and remote turn-on wires, following the amplifier's installation guide.
- Reconnect Battery: Once all connections are secure and verified, reconnect the vehicle's negative battery terminal.
Safety Warning: If you are unsure about any part of the installation process, it is recommended to seek professional assistance from a qualified car audio installer.
4. Operation
The Thunderform CXP20UT enclosure itself does not have operational controls. Its function is to house and optimize the performance of your installed subwoofers. Operation of your subwoofer system will depend on your amplifier and head unit settings.
4.1. Initial Setup and Tuning
- Amplifier Gain: Adjust the gain setting on your amplifier according to the manufacturer's recommendations and your head unit's output. Start with the gain at its lowest setting and gradually increase it until you achieve a balanced sound without distortion.
- Crossover Settings: Set the low-pass filter (LPF) on your amplifier or head unit to direct only low frequencies to the subwoofers. A common starting point is between 80Hz and 120Hz.
- Bass Boost: Use bass boost sparingly, if at all, as excessive boost can lead to distortion and potential damage to your subwoofers.
- Phase Control: Experiment with the phase switch (0° or 180°) on your amplifier or head unit to find the setting that provides the most impactful and cohesive bass response with your main speakers.
Refer to the user manuals for your specific subwoofers, amplifier, and head unit for detailed tuning instructions.
5. Care and Maintenance
Proper care will ensure the longevity and optimal performance of your Thunderform enclosure and subwoofers.
- Cleaning: Wipe the exterior of the enclosure with a soft, damp cloth. Avoid harsh chemicals or abrasive cleaners that could damage the finish.
- Subwoofer Inspection: Periodically check the subwoofer surrounds and cones for any signs of damage or wear. Ensure all mounting screws remain tight.
- Wiring: Occasionally inspect all wiring connections for looseness or corrosion. Secure any loose connections.
- Environmental Factors: Protect the enclosure and subwoofers from extreme temperatures, direct sunlight, and excessive moisture.
6. Troubleshooting
If you experience issues with your subwoofer system, consult the following common troubleshooting steps:
| Problem | Possible Cause | Solution |
|---|---|---|
| No Bass Output |
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| Distorted Bass |
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| Weak or Unbalanced Bass |
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For persistent issues, consult a professional car audio technician.
7. Specifications
| Feature | Detail |
|---|---|
| Model | CXP20UT |
| Enclosure Type | Unloaded, Sealed Custom-Fit |
| Subwoofer Capacity | Dual 10-inch (subwoofers not included) |
| Total Volume | 1.9 cubic feet |
| Mounting Depth | 5 3/8 inches |
| Dimensions (H x W x D) | 10-1/2" x 48-1/2" x 15-1/2" |
| Color | Tan (matches factory interior) |
| Vehicle Placement | Under rear seat |
| Included | Enclosure, Mounting Hardware |
8. Warranty and Support
For specific warranty information regarding your MTX Audio Thunderform CXP20UT enclosure, please refer to the documentation provided at the time of purchase or visit the official MTX Audio website. Warranty terms typically cover manufacturing defects.
If you require technical support or have questions not covered in this manual, please contact MTX Audio customer service or your authorized dealer.
MTX Audio Official Website: www.mtx.com
