M FOUR    定價NT$17800

Small footprint 4-channel amplifier with integrated active crossover



Product Speclflcation



If you like to rev up your front and rear speakers, the M FOUR will be exactly the right "tool" to do so. With generously 100 Watts RMS per channel into both 4 Ohms and 2 Ohms load this amp will heat up your voice coils in no time despite its super-compact dimensions. On the other hand the M FOUR stays totally cool thanks to the highly efficient Class D design topology. 3-channel or 2-channel configurations are possible as well, delivering up to 2 x 200 Watts RMS of clean and undistorted output power.


Needless to say that the M FOUR is equipped with a bunch of intelligent attributes like "start-stop capability" and our proprietary "ADEP" highlevel input so that it easily deals with all installation challenges of modern cars. Finally the extensive audio features will offer a sound quality at its best.




  • Small footprint Class D amplifier with high output power of 100 Watts RMS @ 4 and 2 Ohms load

  • Start-Stop capability down to 6V supply voltage

  • Smart highlevel input with ADEP circuit (Advanced Diagnostics Error Protection) and Auto Turn-On function

  • Integrated, active crossover with highpass, lowpass and bandpass


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 FOUR.
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 FOUR assures operation even if the battery’s voltage drops down to 6 Volts during engine crank.




Output power RMS / max.     
- @ 4 Ohms  
- @ 2 Ohms    
- @ 1 Ohm    
- bridged @ 4 Ohms    
- bridged @ 2 Ohms    

Max. output power per channel*    

Amplifier technology   




Input sensitivity   



Input impedance RCA / Cinch 

Input impedance highlevel   

Output voltage RCA / Cinch     
Signal converter for digital input    

Frequency response    
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- / lowpass    
Slope subsonic / lowpass    
Signal-to-noise ratio digital input    
Signal-to-noise ratio analog input    98 dB (A-weighted)
Distortion (THD)    
Damping factor    
Operating voltage 
Idle current    
Additional features    




Dimensions (H x W x D)    


4 x 100 / 200 Watts

4 x 100 / 200 Watts


2 x 200 / 400 Watts



Up to 135 Watts RMS @ 2 Ohms

Class D


4 x RCA / Cinch
4 x Highlevel speaker input
1 x Remote In

RCA / Cinch 0.5 - 6 Volts
Highlevel 1.3 - 13 Volts


20 kOhms


13 Ohms


4 x Speaker output




10 Hz - 30,000 Hz


15 Hz - 250 Hz adjustable

40 Hz - 250 Hz adjustable

15 Hz - 50 Hz adjustable


12 dB/Oct.


98 dB (A-weighted)


0.05 %


10.5 - 16 Volts (max. 5 sec. down to 6 Volts)

1,100 mA

2 x 30 A Maxi-fuse (APX)


Active, adjustable crossover, input mode switch, Start-Stop capability, highlevel input with automatic turn on function and Advanced Diagnostics Error Protection (ADEP)

50 x 230 x 154 mm /
2.00 x 9.06 x 6.06”