• Very compact class D amplifier with high output power of 100 watts RMS at 4 and 2 ohms
  • Starting plugability down to 6V supply voltage
  • Intelligent high level input with ADEP (Advanced Diagnostics Error Protection) circuitry and auto power on
  • Integrated, active crossover with high pass, low pass and bandpass
  • “Input Mode” switch for flexible distribution of input signals
  • SMD (Surface Mounted Device) technology combines minimal space requirements with maximum reliability
  • Exclusive, very compact design with illuminated HELIX logo and low heat generation thanks to very high efficiency
SKU: HA14107 Category: Tag:


If you want to get their front and rear speakers up to speed, then the M FOUR is just the right “tool” for it. With a whopping 100 watts continuous power per channel at 4 ohms as well as at 2 ohms, it heats the voice coils despite their super-compact dimensions. The amp itself stays cool thanks to its highly efficient Class D technology. But even in 3-channel or 2-channel configurations, with up to 2 x 200 watts RMS, it really gets down to business.

Thanks to the start-stop capability and the intelligent ADEP high-level input, the M FOUR can handle all the challenges that today’s vehicles pose when it comes to integrating an amplifier. And the perfect sound is also quickly found thanks to the integrated crossover and the extensive adjustment options.

Class D High Level Input RCA Input ADEP Active crossover Start-stop capability SMD Ultracompact dimensions


Special features:

Intelligent high-level input
Modern, factory-installed car radios are becoming increasingly intelligent in terms of diagnosing the connected speakers. If an amplifier is connected to the radio instead, it usually results in error messages up to the elimination of individual functions (such as faders). The new Advanced Diagnostics Error Protection (ADEP) circuitry eliminates all of these problems without unduly stressing the radio’s speaker outputs at high levels.

Start Plugability
The power supply unit in the HELIX M FOUR amplifier ensures the internal power supply even with short-term drops down to 6 volts. This ensures that the HELIX M FOUR remains fully functional even when the engine is started.



Power RMS / Max.

– @ 4 ohms 4 x 100/200 watts

– @ 2 ohms 4 x 100/200 watts

– @ 1 ohm

– bridged to 4 ohms 2 x 200/400 watts

– bridged to 2 ohms

amplifier technology Class D

inputs 4 x RCA

4 x high-level speaker input

1 x Remote In

input sensitivity RCA 0.5 – 6 volts

high 1.3 – 13 volts

Input impedance RCA 20 kOhm

Input impedance high level 13 ohms

outputs 4 x speaker output

Output voltage RCA

Signal converter for the digital input

frequency range 10 Hz – 30,000 Hz

Bass Boost

highpass 15 Hz – 4,000 Hz adjustable

lowpass 40 Hz – 4,000 Hz adjustable

bandpass 15 Hz – 4,000 Hz adjustable



Slope high / low pass 12 dB / oct.

Slope Subsonic / Low Pass

Signal-to-noise ratio digital input

Signal-to-noise ratio analog input 98 dB (A-weighted)

Harmonic distortion (THD) 0.05%

damping factor 100

operating voltage 10.5 – 16 volts (maximum 5 seconds down to 6 volts)

No-load current 1,100 mA

fuse 2 x 30 A maxi plug-in fuse (FK3)

Additional features Active, adjustable crossover, input mode switch, start-up capability, auto-engaged high level input and Advanced Diagnostics Error Protection (ADEP)

Dimensions (H x W x D) 50 x 230 x 154 m


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