Hidden Audio Bluetooth Amplifier Secret Stereo MTX Version


Sale price£259.99


Secret Stereo Remote Controlled Bluetooth Amplifier

This easy-to-install tiny hidden Bluetooth amplifier is controlled by the on-dash or under-dash mounted Bluetooth Interface Controller.

Stream music from your smartphone or other Bluetooth-enabled portable music devices.

Can be installed in Classic Cars, Boats, Trailers, or any 12-volt negative earth vehicle.

If you have a vehicle that is difficult to fit a normal radio, for instance, the Morris Minor you could fit this kit and download a radio app to your phone like Radioplayer

No need to drill the car to fit an aerial.

Retain the appearance of your vehicle's interior & exterior.

Bluetooth Interface Controller

Add Bluetooth to any audio system with this simple, weatherproof controller. Built as tough as the trails you ride, the controller makes it easy to change the source, volume, or track at any speed - on any terrain.

Equipped with a stereo RCA output the Bluetooth Controller automatically pairs with your phone and mutes the music for incoming calls (does not provide hands-free capability).


2 Channel Amplifier

The MTXTR275 is a small but powerful Class A/B amplifier. Designed to run a pair of speakers or it can be bridged to power a 4 ohm subwoofer like the MTXTR12-04. It has a tiny footprint measuring just 18cm wide and 13.5cm deep which means it can be installed practically anywhere!

Its variable active filter allows it to be extremely precise: 12dB / oct high pass or variable low pass from 50 to 120Hz. If you don't know where to start adjusting the active filter, the potentiometer is equipped with an 80Hz "click" position. This is a great starting point.

To avoid interference problems, the TR275 is equipped with balanced inputs. They perfectly isolate the audio ground of the amp so that it does not mix with the noisy ground of the power supply. This is a powerful technique that is usually found on much higher end amps.

If your car radio is not equipped with RCA outputs, you can connect the TR275 to the high level inputs. All you need to do is connect the HP cables directly to the high level input of the amplifier. Simple and very practical!

  • 2-channel Class-AB wide range amplifier
  • 2x110W RMS @ 2Ω and THD + N ≤1%
  • 2x75W RMS @ 4Ω and THD + N ≤1%
  • 1x220W RMS bridged @ 4Ω and THD + N ≤1%
  • Fuse rating: 40A
  • High Pass (HPF) 12dB/oct @80Hz
  • Low Pass (LPF) 12dB/oct @80Hz
  • Signal / noise ratio (1 Watt):> 74dB
  • Frequency response (± 1dB): 10Hz-60000Hz
  • Sensitivity level: 200mV to 6V
  • Low-level (RCA) and high-level (speakers) inputs
  • All aluminium construction
  • Dimensions: 180 x 135 x 52mm


    The enclosure has to have at least 5 cm (2) ventilation space at all sides, to allow the heat to rise away from the amplifier. Be sure that the power and signal cables can enter the enclosure in a straight line, to avoid the risk of malfunction. Always place the power- and signal cables at opposite sides of the vehicle to reduce any noises. The amplifier should be protected from exposure to moisture and direct sunlight.


    Remember to always disconnect battery ground before working on a vehicles electrical system! Always place a fuse or circuit breaker no more than 30 cm (12) from the battery, no greater than the fuse(s) of your amplifier for optimal protection.


    First, the +12V terminal is connected directly to the battery of your car. Use a cable of at least 10 mm2 and make sure that the connectors are of the same value. Don't forget the extra Vehicle protection fuse. The +12V terminal should NOT be connected to the car fuse box.

    Second, the ground terminal (GND) must be fastened securely to the chassis of the vehicle with the same mm2 cable as the positive cable (the same amount of power has to run through it). Ensure that all paint, undercoating or any other insulation is removed from the area where you want to make your connection to.

    Finally, there is still one wire to connect, to switch the amplifier ON or OFF. This is the yellow wire. Connect this wire to the ignition of your vehicle, for switching ON and OFF simultaneously with the vehicle. Or connect it to a separate switch, so that the amplifier can be switched ON or OFF whenever you want.


    Pay attention in connecting your speakers. Be sure to observe correct speaker output connections for the front, rear and their polarity.

    Do not use the negative speaker output commonly for left and right speakers (common ground). Improper polarity causes a loss of bass response.

    Never connect the negative speaker output to the chassis of your vehicle. This can cause severe damage to your Car Audio System.


    Put the input level adjustment knob to the minimum.

    Put the volume of your source to 3/4 of the maximum.

    Now adjust the input level of the front channel. Slowly turn up the input level and listen carefully until you hear the amplifier begin to distort. An MTX Amplifier clips very softly, so this can sometimes be a difficult adjustment.

    Specification of the Bluetooth Controller:

    • Ideal for Use in Boats, Jetskis, ATV's and Cars/Trucks
    • Replaces Head Unit and Works with Any Amplifier
    • Three Mounting Options – Surface, Flush, or Clamp
    • Clamp fits 7/8" (22mm), 1" (25,4mm), 1-1/4" (31,7mm) handlebars
    • Weather-Proof Design
    • Five Front front-panel touch Controls
    • Backlit buttons for easy use day or night
    • Works with Most Bluetooth Devices Including Smartphones and Tablets
    • Hassle Free Bluetooth Auto-Pairing
    • Includes Power, Ground, and Output Connections


      • Controls: Volume plus, Volume minus, Play / Pause, Next and previous song
      • IP66 waterproof certified
      • 12V power supply
      • Diameter: 59mm
      • Thickness: 24mm
      • Embedding depth: 19mm

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