HELIX M FOUR - Small footprint 4-channel amplifier with integrated active crossover
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.
Features
- 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
- “Input mode” switch for flexible input signal routing
- SMD (Surface Mounted Device) manufacturing technology combines minimum space requirement with maximum reliability
- Exclusive, extremely compact and clean design with illuminated HELIX-logo and 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 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.
Technical data
| 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 | - |
| Max. output power per channel* | Up to 135 Watts RMS @ 4 / 2 Ohms |
| Amplifier technology | Class D |
| Inputs | 4 x RCA / Cinch 4 x Highlevel speaker input 1 x Remote In |
| Input sensitivity | RCA / Cinch 0.5 - 6 Volts Highlevel 1.3 - 13 Volts |
| Input impedance RCA / Cinch | 20 kOhms |
| Input impedance highlevel | 9 - 33 Ohms |
| Outputs | 4 x Speaker output |
| Output voltage RCA / Cinch | - |
| 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, highlevel 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” |
* In typical multi-channel applications (2- / 3-way system + rear + subwoofer)
Scope of delivery
1 x Amplifier HELIX M FOUR
1 x Mounting material
1 x Instruction manual
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