Q: What does the REM connection on the MTX Audio TX81000D car amplifier mean and how do I use it?

The REM (Remote) connection on the MTX Audio TX81000D amplifier is the power on/off control terminal for the amplifier. It allows the amp to turn on or off automatically based on the control signal sent by your audio source (car radio/head unit). The REM connection works by applying a voltage of +12 volts to this terminal. When your car radio is turned on, it automatically sends this +12V signal via a dedicated wire marked "Remote" or "Power Antenna". As soon as this +12V reaches the REM connector of the TX81000D, the amplifier turns on. Conversely, when the car radio is turned off, the signal disappears and the amplifier automatically shuts down, thus preventing unnecessary battery drain. Connecting the REM wire: Locate the remote control wire on your audio source (car radio). This is usually a small gauge blue wire located at the back of the head unit. Connect this wire directly to the REM connector of the TX81000D. Make sure to push the connector all the way in to ensure a good electrical contact. Important: When using high-level inputs (speaker output) on the TX81000D, using the REM wire is mandatory to control the amplifier. If your car radio does not have a dedicated remote wire, you will need to use an external one powered by a controllable 12V source. Never connect the REM directly to the vehicle's battery, as this would bypass the control system and could damage the amplifier. If the three "Power" LEDs on the TX81000D remain off after connection, first check that the +12V is present at the REM connector. Use a multimeter to ensure that the remote control signal is properly passing from the car radio to the amplifier.

Question 1

How to connect the MTX Audio TR450 amplifier in mono to power a single subwoofer?

Accepted Answer

Yes, it is possible to connect the MTX Audio TR450 amplifier in mono to power a single subwoofer using the bridged mode.

Bridged connection:

The MTX Audio TR450 is a 4-channel amplifier that can operate in bridged mode, which involves combining two channels to increase the output power to a single speaker, such as a subwoofer.
For bridged mode, you can use:

The positive terminal (+) of channel 1 and the negative terminal (-) of channel 2, or
The positive terminal (+) of channel 3 and the negative terminal (-) of channel 4.

Important tips:

Set the low-pass filter (LP) on the amplifier to optimize the audio output suitable for the subwoofer.
Ensure that the impedance of the subwoofer is at least 4 ohms, as this is the minimum impedance accepted in bridged mode for this model.
The bridged mode increases the power delivered, which is ideal for a subwoofer requiring more power.

By following these guidelines, you will be able to effectively power a single subwoofer with your MTX Audio TR450 amplifier in mono mode.

Question 2

Does the MTX Audio TX81000D car radio work without connecting the REM (CCA) wire?

Accepted Answer

No, the MTX Audio TX81000D cannot operate without the REM wire properly connected. Although the amplifier receives the main power through the 12V cable and ground, the REM wire is essential to activate the amplifier. The REM wire is a power on/off control that must receive a +12V signal from your audio source (car radio or preamplifier).

Without the REM wire connected and powered with +12V, the amplifier will not turn on, even if the 12V power is properly connected. The three LEDs on the front panel will remain off and no power will be delivered to the speakers or subwoofer. This behavior is particularly strict when using high-level inputs (speaker level adapters): the manual specifies that the REM wire must be used with this type of input.

The REM wire usually comes from the car radio and is identifiable by its blue color or markings such as “Remote” or “Power Antenna”. It is a low gauge cable (unlike the main 12V cable which must be at least 50 mm²). By connecting this wire to the “REM” terminal of the amplifier, you ensure synchronized activation of the amplifier with your audio source and optimal management of the vehicle's electrical consumption.

If your car radio does not have a dedicated REM wire, you have the option to use a bass control remote (EBC) that connects to the dedicated port and can be used to control the amplifier, but this does not replace the main REM wire for normal power supply.

Question 3

What does the REM connection on the MTX Audio TX81000D car amplifier mean and how do I use it?

Accepted Answer

The REM (Remote) connection on the MTX Audio TX81000D amplifier is the power on/off control terminal for the amplifier. It allows the amp to turn on or off automatically based on the control signal sent by your audio source (car radio/head unit).

The REM connection works by applying a voltage of +12 volts to this terminal. When your car radio is turned on, it automatically sends this +12V signal via a dedicated wire marked "Remote" or "Power Antenna". As soon as this +12V reaches the REM connector of the TX81000D, the amplifier turns on. Conversely, when the car radio is turned off, the signal disappears and the amplifier automatically shuts down, thus preventing unnecessary battery drain.

Connecting the REM wire: Locate the remote control wire on your audio source (car radio). This is usually a small gauge blue wire located at the back of the head unit. Connect this wire directly to the REM connector of the TX81000D. Make sure to push the connector all the way in to ensure a good electrical contact.

Important: When using high-level inputs (speaker output) on the TX81000D, using the REM wire is mandatory to control the amplifier. If your car radio does not have a dedicated remote wire, you will need to use an external one powered by a controllable 12V source. Never connect the REM directly to the vehicle's battery, as this would bypass the control system and could damage the amplifier.

If the three "Power" LEDs on the TX81000D remain off after connection, first check that the +12V is present at the REM connector. Use a multimeter to ensure that the remote control signal is properly passing from the car radio to the amplifier.

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