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MTX Audio RT8PT Universal Powered Subwoofer Enclosure Manual

MTX Audio RT8PT Universal Powered Subwoofer Enclosure FEATURE


MTX Audio RT8PT Universal Powered Subwoofer Enclosure

MTX Audio RT8PT Universal Powered Subwoofer Enclosure PRODUCT

About MTX Audio
A venerable American consumer audio company is called MTX Audio. We produce top-notch audio equipment for a variety of uses, such as live sound, residential, marine, and automobile audio.


Thank you for purchasing an MTX Audio Hi-Performance powered tube. Proper installation matched with MTX speakers and amplifiers provides superior sound and performance for endless hours of waking the neighbors, slammin’ your friends, or flat-out stomping wanna-be players. Congrats and enjoy the ultimate audio experience with MTX!


  • Powered vented enclosure
  • Subwoofer: 20cm (8)
  • Amplifier Max Power: 360W
  • Amplifier RMS Power: 120W
  • EBC remote included
  • High and low-level inputs
  • Dimensions: 25×25×54cm

Control Panel on the AmplifierMTX Audio RT8PT Universal Powered Subwoofer Enclosure Manual-fig 1

  1. Speaker-level inputs – This input will allow the amplifier to operate from source units with speaker-level outputs.
    Output speaker leads from the source unit should be tied directly to the wire harness provided with the amplifier.
    Note: When speaker-level inputs are used, a remote turn-on wire must used to switch the amplifier on and off.MTX Audio RT8PT Universal Powered Subwoofer Enclosure Manual-fig
  2. EBC Port (External Bass Control) – The Remote Subwoofer Level Control (EBC) plugs directly into this port, while the EBC itself can be placed anywhere in the vehicle for on-demand bass adjustments. EBC is included.MTX Audio RT8PT Universal Powered Subwoofer Enclosure Manual-fig 3
  3. RCA Inputs – These RCA inputs are used with source units that have RCA or Line level outputs. (Source units need a minimum level of 100mV output for proper operation of the amplifier). MTX recommends only high-quality twisted pair cables (such as StreetWires) to decrease the possibility of radiated noise entering the system.MTX Audio RT8PT Universal Powered Subwoofer Enclosure Manual-fig 4
  4.  Gain Control – The gain control matches the input sensitivity of the amplifier to the source unit being used. The operating range varies from 100mv to 6V. Adjusting the gain
    1. Turn the gain control on the amplifier down (counterclockwise).
    2. Turn up the volume control on the source unit to approximately 3⁄4 of the maximum.
    3. Adjust the gain control on the amplifier until audible distortion occurs.
    4. Adjust the gain control down until audible distortion disappears.
    5. The amplifier is now calibrated to the output of the source unit.MTX Audio RT8PT Universal Powered Subwoofer Enclosure Manual-fig 5
  5. Low Pass X-Over Frequency Control – Used to select the desired low-pass (LP) x-over frequency. The frequency is adjustable from 50Hz to 200Hz.MTX Audio RT8PT Universal Powered Subwoofer Enclosure Manual-fig 6
  6. Protection LED – When the amps are in thermal protection, the LED turns red.
  7. PowerOn LED –  The LED illuminates red when the amp is switched on.MTX Audio RT8PT Universal Powered Subwoofer Enclosure Manual-fig 8
  8. (+12V) Power Terminal – This is the main power input for the amplifier and must be connected directly to the positive terminal of the vehicle’s battery for proper operation. Use caution when installing (+12V) power cables in the vehicle. Avoid running this cable parallel with RCA cables, antennas, or other sensitive equipment due to massive currents that can induce noise into the audio system. It is also very important to have a tight, secure connection for maximum performance. MTX recommends using a minimum of 6mm2 full copper power wire with the MTX RT8PT powered tube.
  9. Remote Terminal – The powered tube can be turned on by applying 12 volts to this terminal. Typically this voltage is supplied by a wire from the source unit marked “remote” or “power antenna”.
  10. Ground Terminal – A proper ground is required for your amplifier to operate at peak performance. A short ground cable the same diameter as the power cable should be used to attach the ground terminal directly to the chassis of the vehicle. Always remove paint, dirt, or debris to expose bare metal where the ground will be attached.MTX Audio RT8PT Universal Powered Subwoofer Enclosure Manual-fig 9
  11. Fuses – When the fuse blows, replace it with the same value. The RT8PT uses a 20A fuse

Caution: Never use a higher-rated fuse!

Installation & Mounting

MTX recommends your new RoadTHUNDER powered tube to be installed by an Authorized MTX retailer. Any deviation from specified installation instructions can cause serious damage to the amplifier, speakers, and/or vehicle’s electrical system. Damage caused by improper installation is NOT covered under warranty. Please verify all connections before turning on your system!

  1. Disconnect the vehicle’s negative battery cable.
  2. Determine the mounting place for your MTX-powered enclosure. Hook it with the provided belts. Keep in mind there should be sufficient airflow for proper cooling.
  3. Install a positive (+) power cable from the vehicle’s battery through the firewall using a grommet or firewall bushing to avoid cable damage from the sharp edges of the firewall. Run the cable through the interior of the vehicle and connect it to the amplifier’s (+12V) terminal (8). Do Not connect to the battery at this time. Note: Use only proper gauge wire for both positive and negative connections.
  4. Install a circuit breaker or fuse within 20cm of the battery. This effectively lowers the risk of severe damage to you or your vehicle in case of a short circuit or accident. Make sure the circuit breaker is switched off or the fuse is taken out of the fuse holder until all connections are made. Now connect your positive power cable to the positive battery terminal of the battery.
  5. Grounding – Locate a proper ground point on the vehicle’s chassis and remove all paint, dirt, or debris to reveal a bare metal surface. Attach the ground wire to that contact point. Connect the opposite end of the ground wire to the (GND) terminal on the MTX amplifier (10).
  6. Connect a remote turn-on wire from the source unit to the powered tube remote terminal (9). If the source unit does not have a dedicated Remote Turn-on lead, you may connect to the source unit’s Power Antenna lead.
  7. Connecting signal cables to the amplifier: There are two ways to supply the signal to your MTX-powered tube.
    • To get maximum performance, we suggest connecting a high-quality RCA to the corresponding outputs at the source unit and inputs of the amplifier.
    • If a source unit is being used without RCA outputs, use the included high-level amplifier’s speaker terminals (1) using the right gauge speaker wire.
  1. Double-check all previous installation steps, in particular, wiring and component connections. Once verified, reconnect the vehicle’s negative battery cable, turn the circuit breaker on, or place the fuse in the fuse holder.

Note: Gain Levels on the amplifier should be turned down (counterclockwise) before proceeding with adjustments.

FAQS About MTX Audio RT8PT Universal Powered Subwoofer Enclosure

1. What are the dimensions and weight of the RT8PT?

The RT8PT measures 9.84″ x 9.84″ x 21.25″ (H x W x L) and weighs 20.8 lbs.

2. What is the power output of the RT8PT?

The RT8PT features a built-in 120-watt RMS amplifier, providing ample power to drive the 8-inch subwoofer.

3. What type of enclosure is the RT8PT?

The RT8PT is a vented enclosure, which means it has a port that allows air to flow in and out of the enclosure. This helps to improve the bass response of the subwoofer.

4. What is the frequency response of the RT8PT?

The frequency response of the RT8PT is 25Hz – 200Hz. This means that it can reproduce very low bass frequencies, as well as higher frequencies.

5. What is the impedance of the RT8PT?

The impedance of the RT8PT is 4 ohms. This means that it can be safely connected to most car audio amplifiers.

6. What are the input options for the RT8PT?

The RT8PT has both high-level and low-level inputs. This means that it can be connected to either the speaker outputs of your car stereo or the preamp outputs of an aftermarket amplifier.

7. Does the RT8PT have a remote control?

Yes, the RT8PT comes with a wired remote control that allows you to adjust the bass level from the driver’s seat.

8. Is the RT8PT easy to install?

Yes, the RT8PT is relatively easy to install. It comes with all the necessary hardware, and the instructions are clear and easy to follow.

9. What are some of the pros and cons of the MTX Audio RT8PT?

Compact size
Powerful bass output
Easy to install
Includes remote control

Not as powerful as some other subwoofers
Limited sound customization options

10. What is the warranty on the MTX Audio RT8PT?

The MTX Audio RT8PT comes with a 1-year warranty against manufacturing defects.

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