The MTX Terminator Series amplifiers are designed to enhance vehicle audio systems. These amplifiers, including models TN250.1, TN500.1, TN1000.1, TN150.2, TN300.4, and TN800.5, feature Class-D circuit design and are intended for installation by authorized MTX dealers or qualified technicians. The series offers features such as direct insert power and speaker terminals, power and protection LED indicators, and various protection mechanisms against short circuits, overheating, and voltage fluctuations. Proper installation and connection to the vehicle’s electrical system are crucial for optimal performance and to prevent damage.
Amplifier Features and Specifications
The MTX Terminator Series amplifiers incorporate several features designed for reliable performance and ease of installation. These include a Class-D circuit design for efficiency, a small footprint for flexible mounting options, and surface mount component technology. The amplifiers are equipped with direct insert power and speaker terminals, accepting up to 4 AWG power and ground cables and 10 AWG speaker cables. A key feature is the inclusion of short, thermal, and under/over voltage protection circuitry.
Specific models within the Terminator Series have varying dimensions. The TN250.1 measures 6 5/16" x 5 7/16" x 2", while the TN500.1 is 7 1/8" x 5 7/16" x 2". The TN1000.1 measures 8 5/16" x 5 7/16" x 2", the TN150.2 is 6" x 5 7/16" x 2", the TN300.4 is 7 1/8" x 5 7/16" x 2", and the TN800.5 is 11 9/16" x 5 7/16" x 2". All models have a height of 2 inches. The TNA251 model specifically has a maximum power output of 250 watts and utilizes a Class AB topology. It also includes a variable low-pass filter and a bass boost control.
Installation Procedures
MTX recommends professional installation of the Terminator Series amplifiers to ensure proper operation and prevent damage to the amplifier, speakers, or vehicle’s electrical system. Incorrect installation voids the warranty. Before beginning installation, disconnect the vehicle’s negative battery cable.
The installation process involves connecting several terminals:
- Power Terminal (+12V): Connect this terminal to the vehicle’s positive battery terminal using a power cable and an inline fuse or circuit breaker. The amplifier accepts up to a 4 AWG power cable.
- Ground Terminal: Connect this terminal to the vehicle’s chassis using a ground cable of equivalent gauge to the power cable. The amplifier accepts up to a 4 AWG ground cable.
- Remote Terminal: Connect this terminal to the remote wire from the source unit. This wire activates the amplifier when the source unit is powered on.
- Speaker Terminals (+ / –): Connect these terminals directly to the speakers or subwoofers using up to 10 AWG speaker cable.
When installing subwoofers, they must be installed in an enclosure to function correctly. Subwoofers can be mounted in the vehicle trunk, under or behind the seat, or in a custom enclosure. MTX offers ThunderForm custom molded enclosures. Proper wiring of the subwoofer, ensuring correct impedance and phase, is essential before connecting to the amplifier.
Control Functions and Adjustments
The Terminator Series amplifiers feature several control functions for optimizing performance. The gain control matches the amplifier’s input sensitivity to the source unit’s output. The operating range for the gain control is 200mV to 6V. The amplifiers accept both low-level (RCA) and high-level (speaker) inputs up to 6V, requiring a minimum of 200mV output from the source unit for proper operation.
The TNA251 model includes a variable low-pass filter for adjusting the frequency range and a bass boost control for enhancing the bass frequencies. Adjusting the gain settings involves playing a music track at a moderate volume and gradually increasing the gain until a balanced sound is achieved without distortion or clipping. It is important to consider both the amplifier’s gain and the input level adjustment on the source unit. Fine-tuning may be necessary after installation due to varying output levels from different audio sources.
Phase Adjustment and Bridging
The Terminator Series amplifiers include a phase switch, allowing for inversion of the amplifier outputs. Setting the phase to 180° can improve bass response in certain applications. The default phase is 0°.
The TNA251 model is a mono-channel amplifier and cannot be bridged. However, it is 2-ohm stable, allowing connection of a single 2-ohm subwoofer for optimal performance.
Safety Precautions
Several safety precautions should be observed during installation and operation. It is recommended to disconnect the vehicle’s battery before working on the electrical system to prevent electric shock or equipment damage. When connecting power and ground wires, ensure the power wire is fused at the point of connection to the battery to protect against short circuits and potential vehicle damage.
The product documentation includes warning and caution symbols to highlight important operating and maintenance instructions. Following these instructions is crucial for preventing injury and damage to the unit. If unsure about the installation process, it is recommended to have the system installed by a qualified MTX technician.
Troubleshooting and FAQs
The MTX website provides resources for installation and technical support, including chat, phone support (1-800-225-5689), and product videos on YouTube (www.youtube.com/user/MTXAudioUSA). A frequently asked questions (FAQ) section addresses common issues.
Common questions include:
- Connecting to the car’s power supply: Ensure a secure connection to the battery using appropriate gauge wires and proper fuses.
- Adjusting gain settings: Start with a mid-range volume, gradually increase the gain until a balanced sound is achieved without distortion, and consider both amplifier gain and source unit input level.
- Bridging channels: The TNA251 cannot be bridged.
- Speaker wire size: 16 gauge or thicker speaker wire is recommended.
- Compatibility with factory head units: The amplifier is designed to work with most factory-installed and aftermarket car audio systems.
Warranty Information
The MTX Audio Terminator TNA251 amplifier comes with a one-year warranty, covering defects and malfunctions. Damage caused by improper installation is not covered under warranty. Product registration is encouraged via the MTX website (www.mtx.com/productregistration) or by scanning the provided QR code.
Conclusion
The MTX Terminator Series amplifiers offer a range of features and power options for enhancing vehicle audio systems. Proper installation, adhering to the provided safety precautions, and careful adjustment of control functions are essential for optimal performance and longevity. Utilizing the available support resources and understanding the amplifier’s specifications will contribute to a successful and enjoyable audio upgrade experience.