Small, efficient and uncompromisingly stable – the M ONE X is a highly compact monoblock for subwoofer applications. Designed from latest Class D technology this tiny amp can easily control speakers with 1 Ohm impedance. Its current capability makes the M ONE X a perfect partner for 2 x 2 Ohms subwoofers, where both voice coils are connected in parallel. And for even more output power, two M ONE X amplifiers can be combined to one single powerhouse – thanks to the TwinPower Link.

In addition a comprehensive and stunningly practical feature set leaves nothing to be desired. Last but not least installation will be a no-brainer due to the minimal dimensions.

Class-D Highlevel-Input RCA-InputRemmote-Control-ready ADEP Active crossover Start-Stop-Capability SMD Ultra compact dimensionsTwinPower Link


  • Small footprint Class D amplifier with up to 1,180 Watts RMS output power @ 1 Ohm for easiest combination with all 2 x 2 Ohms subwoofers connected in parallel
  • Start-Stop capability down to 6V supply voltage
  • Smart highlevel input with ADEP circuit and Auto Turn-On function
  • Integrated, active crossover with lowpass, bass boost, subsonicand phase control
  • TwinPower Link for connecting two amplifiers in bridged mode
  • Bass remote control for volume adjustment
  • Low heat dissipation thanks to extraordinary efficiency


Special features:

Smart highlevel input
The latest generation of OE car radios incorporates sophisticated possibilities of diagnosing the connected speakers. If a common amplifier will be hooked up failure messages and loss of specific features (e.g. fader function) quite often appear – but not with the M ONE X.
The new ADEP circuit (Advanced Diagnostics Error Protection) avoids all these problems without loading the speaker outputs of the OE radio during high volumes unnecessarily.

Start-Stop capability
The switched power supply of the HELIX M ONE X assures operation even if the battery’s voltage drops down to 6 Volts during engine crank.

Power RMS ≤ 1% THD+NNormal operation
(One amplifier)
TwinPower Link
(Two amplifiers)
– @ 4 Ohms1 x 400 Watts1 x 1,400 Watts
– @ 2 Ohms1 x 700 Watts1 x 2,060 Watts
– @ 1 Ohm1 x 1,030 Watts
– bridged @ 4 Ohms
– bridged @ 2 Ohms
Max. output power per channel*:Up to 1,180 Watts RMS @ 1 Ohm
Amplifier technologyClass D
Inputs2 x RCA / Cinch
2 x Highlevel speaker input
1 x Remote In
1 x Remote control input
Input sensitivityRCA / Cinch 0.5 – 6 Volts
Highlevel 1.1 – 13 Volts
Input impedance RCA / Cinch20 kOhms
Input impedance highlevel9 – 33 Ohms
Outputs1 x Speaker output
Output voltage RCA / Cinch
Signal converter for digital input
Frequency response10 Hz – 250 Hz
Bass boost0 – 12 dB / 30 – 80 Hz
Lowpass50 Hz – 250 Hz adjustable
Bandpass10 Hz – 250 Hz adjustable
Subsonic10 Hz – 50 Hz adjustable
Phase0 – 180° adjustable
Slope high- / lowpass
Slope subsonic / lowpass12 / 24 dB/Oct.
Signal-to-noise ratio digital input
Signal-to-noise ratio analog input95 dB (A-weighted)
Distortion (THD)0.20 %
Damping factor150
Operating voltage10.5 – 16 Volts (max. 5 sec. down to 6 Volts)
Idle current800 mA
Fuse3 x 40 A Maxi-fuse (APX)
Additional featuresActive, adjustable crossover, bass boost, phase shift, Start-Stop capability, highlevel input with automatic turn on function and Advanced Diagnostics Error Protection (ADEP), bass volume cable remote control
Dimensions (H x W x D)50 x 320 x 154 mm /
2.00 x 12.60 x 6.06”
Delivery contents

1 x Amplifier HELIX M ONE X
1 x Cable remote control
1 x Mounting material
1 x Instruction manual