Helix M FOUR sound amplifier, 4x100W D-class High input

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" high-level 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 high-level input with ADEP circuit (Advanced Diagnostics Error Protection) and Auto Turn-On function
• Integrated, active crossover with highpass, lowpass and bandpass
• "Input mode" switch for flexible input signal routing
• SMD (Surface Mounted Device) manufacturing technology combines minimum space requirements with maximum reliability
• Exclusive, extremely compact and clean design with illuminated HELIX-logo and low heat dissipation thanks to extraordinary efficiency

Smart high level 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 (eg fader function) appear quite often - 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 ensures operation even if the battery's voltage drops down to 6 Volts during engine cranking.

• Output power RMS / max.
  - @ 4 Ohms 4 x 100 / 200 Watts
  - @ 2 Ohms 4 x 100 / 200 Watts
  - @ 1 Ohm -
  - bridged @ 4 Ohms 2 x 200 / 400 Watts
  - bridged @ 2 Ohms -
• Amplifier technology Class D
• Inputs:
  4 x RCA/Cinch
  4 x High-level speaker input
  1 x Remote In
• Input sensitivity RCA / RCA 0.5 - 6 Volts
• High level 1.3 - 13 Volts
• Input impedance RCA / RCA 20 kOhms
• Input impedance high level 13 Ohms
• Outputs 4 x Speaker output
• Output voltage RCA / RCA -
• Signal converter for digital input -
• Frequency response 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
• Subsonic -
• Phase -
• Slope high- / lowpass 12 dB/Oct.
• Slope subsonic / lowpass -
• Signal-to-noise ratio digital input -
• Signal-to-noise ratio analog input 98 dB (A-weighted)
• Distortion (THD) 0.05%
• Damping factor 100
• Operating voltage 10.5 - 16 Volts (max. 5 sec. down to 6 Volts)
• Idle current 1,100 mA
• Fuse 2 x 30 A Maxi-fuse (APX)
• Additional features Active, adjustable crossover, input mode switch, Start-Stop capability, high-level input with automatic turn on function and Advanced Diagnostics Error Protection (ADEP)
• Dimensions (H x W x D) 50 x 230 x 154 mm / 2.00 x 9.06 x 6.06”

User Guide